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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 IRSIZE (KGTRUNC, KAREA, KLLEN, KNWE, KNNS, KLN,
1 KTOTAL, PGAUSS, OWEGLOBE, ONPOLE, OSPOLE, KPR, KERR)
C
C---->
C**** *IRSIZE*
C
C PURPOSE
C _______
C
C Evaluate the array sizes for a quasi regular Gaussian field.
C
C INTERFACE
C _________
C
C IERR = IRSIZE (KGTRUNC, KAREA, KLLEN, KNWE, KNNS, KLN,
C 1 KTOTAL, PGAUSS, OWEGLOBE, ONPOLE, OSPOLE, KPR, KERR)
C
C Input parameters
C ________________
C
C KGTRUNC - The Gaussian truncation.
C
C KAREA - The field area definition (N, W, S, E) provided by
C the calling routine.
C
C KLLEN - This array contains the quasi regular Gaussian
C line length definition.
C
C KPR - The debug print switch.
C 0 , No debugging output.
C 1 , Produce debugging output.
C
C KERR - The error control flag.
C -ve, No error message. Return error code.
C 0 , Hard failure with error message.
C +ve, Print error message. Return error code.
C
C Output parameters
C ________________
C
C KNWE - The maximum number of points in the West-East
C direction for this quasi regular Gaussian grid.
C
C KNNS - The number of points in the North-South direction
C in the field.
C
C KLN - The Northern Gaussian latitude number for this
C area.
C
C KTOTAL - The total field length for this quasi regular
C Gaussian grid and area.
C
C PGAUSS - The full list of Gaussian latitudes for this
C truncation.
C
C OWEGLOBE - This variable will be true if the array of
C longitudes spans the globe.
C
C ONPOLE - This variable will be true if the North polar line
C of latitude is included in the grid.
C
C OSPOLE - This variable will be true if the South polar line
C of latitude is included in the grid.
C
C Return value
C ____________
C
C The error indicator (INTEGER).
C
C Error and Warning Return Values
C _______________________________
C
C 23801 A non-global area was requested and this option is not
C supported yet.
C
C Common block usage
C __________________
C
C None
C
C EXTERNALS
C _________
C
C IGGLAT - Compute Gaussian lines of latitude for a given
C truncation.
C INTLOG(R) - Logs messages.
C
C METHOD
C ______
C
C
C A global definition is generated for the quasi regular field
C and all three flag variable are set TRUE.
C
C A REAL array of the full set of Gaussian latitudes is generated
C for the Gaussian truncation requested.
C
C REFERENCE
C _________
C
C None
C
C COMMENTS
C ________
C
C Program contains sections 0 to 4 and 9
C
C AUTHOR
C ______
C
C K. Fielding *ECMWF* Nov 1993
C
C MODIFICATIONS
C _____________
C
C None
C
C----<
C _______________________________________________________
C
C
C* Section 0. Definition of variables.
C _______________________________________________________
C
C* Prefix conventions for variable names
C
C Logical L (but not LP), global or common.
C O, dummy argument
C G, local variable
C LP, parameter.
C Character C, global or common.
C H, dummy argument
C Y (but not YP), local variable
C YP, parameter.
C Integer M and N, global or common.
C K, dummy argument
C I, local variable
C J (but not JP), loop control
C JP, parameter.
C REAL A to F and Q to X, global or common.
C P (but not PP), dummy argument
C Z, local variable
C PP, parameter.
C
C Implicit statement to force declarations
C
IMPLICIT NONE
C
#include "parim.h"
C
C Dummy arguments
LOGICAL OWEGLOBE, ONPOLE, OSPOLE
INTEGER KGTRUNC, KNWE, KNNS, KLN, KTOTAL, KPR, KERR
INTEGER KAREA (4), KLLEN (*)
REAL PGAUSS (*)
C
C Local variables
LOGICAL GZERO
INTEGER IGAUSS, ILATNUM, ILS, INDIST, ISDIST, IERR
INTEGER JLAT
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 23800)
C
C Function externals
C
INTEGER IGGLAT
C
C _______________________________________________________
C
C* Section 1. Initialisation
C _______________________________________________________
C
100 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IRSIZE: Section 1.',JPQUIET)
C
IRSIZE = 0
C
IF (KPR .GE. 1) THEN
CALL INTLOG(JP_DEBUG,'IRSIZE: Input parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG,
X 'IRSIZE: Gaussian truncation = ',KGTRUNC)
IF (KNNS .NE. 0) CALL INTLOG(JP_DEBUG,
X 'IRSIZE: No.lat. pts = ',KNNS)
C
CALL INTLOG(JP_DEBUG,'IRSIZE: Area North = ', KAREA(1))
CALL INTLOG(JP_DEBUG,'IRSIZE: Area West = ', KAREA(2))
CALL INTLOG(JP_DEBUG,'IRSIZE: Area South = ', KAREA(3))
CALL INTLOG(JP_DEBUG,'IRSIZE: Area East = ', KAREA(4))
ENDIF
C
GZERO = .FALSE.
C
ILATNUM = KGTRUNC * 2
C
C _______________________________________________________
C
C* Section 2. If all elements of KAREA are zero generate
C a global field
C _______________________________________________________
C
200 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IRSIZE: Section 2.',JPQUIET)
C
Cxxx IF (KAREA (JPEAST) .NE. 0 .OR. KAREA (JPWEST) .NE. 0) THEN
C
Cxxx IRSIZE = JPROUTINE + 1
Cxxx IF (KERR .GE. 0) WRITE (*, 9001) IRSIZE,
Cxxx 1 REAL (KAREA (JPNORTH) ) / PPMULT,
Cxxx 2 REAL (KAREA (JPWEST) ) / PPMULT,
Cxxx 3 REAL (KAREA (JPSOUTH) ) / PPMULT,
Cxxx 4 REAL (KAREA (JPEAST) ) / PPMULT
Cxxx IF (KERR .EQ. 0) CALL ABORTX ('IRSIZE')
Cxxx GO TO 900
Cxxx ENDIF
C
OWEGLOBE = .TRUE.
C
C _______________________________________________________
C
C* Section 3. Generate points along a line of meridian
C _______________________________________________________
C
300 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IRSIZE: Section 3.',JPQUIET)
C
C Generate full Gaussian latitudes for this truncation
C
IERR = IGGLAT (ILATNUM, PGAUSS, KPR, KERR)
C
IF (IERR .GT. 0) THEN
IRSIZE = IERR
GO TO 900
ENDIF
C
C Find Gaussian lines corresponding to North and South points
C provided
C
KLN = 1
ILS = ILATNUM
C
IF (KNNS .EQ. 0) THEN
C
C Number of lines not set (output field)
C
KLN = 0
ILS = ILATNUM
C
DO 310 JLAT = 2, ILATNUM
C
IGAUSS = NINT (PGAUSS (JLAT) * PPMULT)
C
IF (KLN .EQ. 0 .AND. KAREA (JPNORTH) .GT. IGAUSS) THEN
KLN = JLAT - 1
KAREA (JPNORTH) = NINT (PGAUSS (KLN) * PPMULT)
ENDIF
C
IF (ILS.EQ.ILATNUM .AND. KAREA(JPSOUTH).GE.IGAUSS) THEN
ILS = JLAT
KAREA (JPSOUTH) = NINT (PGAUSS (ILS) * PPMULT)
ENDIF
C
310 CONTINUE
C
KNNS = ILS - KLN + 1
C
ELSE
C
C Number of lines set (input field)
C
JLAT = 1
KLN = JLAT
ILS = JLAT
C
INDIST = ABS (NINT (PGAUSS (JLAT) * PPMULT) - KAREA (JPNORTH) )
ISDIST = ABS (NINT (PGAUSS (JLAT) * PPMULT) - KAREA (JPSOUTH) )
C
DO 320 JLAT = 2, ILATNUM
C
IF (ABS (NINT (PGAUSS (JLAT) * PPMULT) - KAREA (JPNORTH) )
1 .LT. INDIST) THEN
C
KLN = JLAT
INDIST = ABS(NINT(PGAUSS (JLAT) * PPMULT) - KAREA(JPNORTH))
C
ENDIF
C
IF (ABS (NINT (PGAUSS (JLAT) * PPMULT) - KAREA (JPSOUTH) )
1 .LT. ISDIST) THEN
C
ILS = JLAT
ISDIST = ABS(NINT(PGAUSS(JLAT) * PPMULT) - KAREA(JPSOUTH))
C
ENDIF
C
320 CONTINUE
C
IF (KNNS .NE. ILS - KLN + 1) THEN
IRSIZE = JPROUTINE + 2
IF (KERR .GE. 0) THEN
CALL INTLOG(JP_ERROR,
X 'IRSIZE: No. lines specified = ',KNNS)
CALL INTLOG(JP_ERROR,
X 'IRSIZE: Gaussian N limit = ',KLN)
CALL INTLOG(JP_ERROR,
X 'IRSIZE: Gaussian S limit = ',ILS)
ENDIF
C
IF (KERR .EQ. 0) CALL INTLOG(JP_FATAL,
X 'IGLSIZE: Interpolation failed.',IRSIZE)
GO TO 900
ENDIF
C
ENDIF
C
ONPOLE = KLN .EQ. 1
OSPOLE = ILS .EQ. ILATNUM
C
KNNS = ILS - KLN + 1
C
KAREA (JPNORTH) = NINT (PGAUSS (KLN) * PPMULT)
KAREA (JPSOUTH) = NINT (PGAUSS (ILS) * PPMULT)
C
C _______________________________________________________
C
C* Section 4. Use line lengths to set maximum length and total
C _______________________________________________________
C
400 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IRSIZE: Section 4.',JPQUIET)
C
KNWE = KLLEN (KGTRUNC)
C
KTOTAL = 0
C
DO 410 JLAT = KLN, ILS
C
KTOTAL = KTOTAL + KLLEN (JLAT)
C
410 CONTINUE
C
IF (KPR .GE. 1) THEN
CALL INTLOG(JP_DEBUG,'IRSIZE: Output parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG,'IRSIZE: Max W-E line len = ',KNWE)
CALL INTLOG(JP_DEBUG,'IRSIZE: No lat lines = ',KNNS)
CALL INTLOG(JP_DEBUG,'IRSIZE: Total no.pts = ',KTOTAL)
CALL INTLOG(JP_DEBUG,'IGLSIZE: Northern line no. =',KLN)
CALL INTLOG(JP_DEBUG,'IGLSIZE: Southern line no. =',ILS)
C
IF( OWEGLOBE ) THEN
CALL INTLOG(JP_DEBUG,'IGLSIZE: W-E fld is global',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,'IGLSIZE: W-E fld is NOT global',JPQUIET)
ENDIF
C
IF( ONPOLE ) THEN
CALL INTLOG(JP_DEBUG,'IGLSIZE: N pole is in fld.',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,'IGLSIZE: N pole is NOT in fld.',JPQUIET)
ENDIF
C
IF( OSPOLE ) THEN
CALL INTLOG(JP_DEBUG,'IGLSIZE: S pole is in fld.',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,'IGLSIZE: S pole is NOT in fld.',JPQUIET)
ENDIF
C
ENDIF
C
C _______________________________________________________
C
C* Section 9. Return to calling routine. Format statements
C _______________________________________________________
C
900 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IRSIZE: Section 9.',JPQUIET)
C
C9001 FORMAT (' IRSIZE ERROR', I6, ' - One of the area limits is ',
C 1 'non-zero.' / 22X, 'They are', 4F10.4)
C
RETURN
END
|
