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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 IGPOLEG(PIFELD, KIWE, POFELD, KOWE, KPR, KERR)
C
C---->
C**** *IGPOLEG*
C
C Purpose
C -------
C
C Calculate the values at the pole of a regular
C latitude/longitude field when the input is a Gaussian field.
C
C This routine is used for any field except a wind field.
C
C Interface
C ---------
C
C IERR = IGPOLEG(PIFELD, KIWE, POFELD, KOWE, KPR, KERR)
C
C Input parameters
C ----------------
C
C PIFELD - A "polar" row of the input field provided by the
C calling routine.
C
C KIWE - The number of points in the West-East direction in
C the input field.
C
C KOWE - The number of points in the West-East direction in
C the output field.
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 POFELD - The corresponding "polar" row of the output field
C returned to the calling routine.
C
C Return value
C ------------
C
C The error indicator (INTEGER).
C
C
C Common block usage
C ------------------
C
C None
C
C Externals
C ---------
C
C INTLOG(R) - Logs messages.
C
C Method
C ------
C
C A Gaussian field does not have a line of latitude at the pole
C so this routine forces all the values on the polar line of
C latitude to the average of the values at the nearest Gaussian
C line in the input field.
C
C This method was originally implemented by
C
C K. RIDER * ECMWF * OCTOBER 1991.
C
C Reference
C ---------
C
C None
C
C Comments
C --------
C
C Program contains sections 0 to 2 and 9
C
C Author
C ------
C
C K. Fielding *ECMWF* Oct 1993
C
C Modifications
C -------------
C
C Allow for missing data values
C J.D.Chambers ECMWF August 2000
C
C----<
C -----------------------------------------------------------------|
C
IMPLICIT NONE
C
#include "parim.h"
#include "nifld.common"
C
C Function arguments
C
INTEGER KIWE, KOWE, KPR, KERR
REAL PIFELD(KIWE), POFELD(KOWE)
C
C Local variables
C
INTEGER JILON, JOLON, COUNT
REAL ZSUM
C
C Statement function
C
REAL A, B
LOGICAL NOTEQ
NOTEQ(A,B) = (ABS((A)-(B)).GT.(ABS(A)*1E-3))
C
C -----------------------------------------------------------------|
C* Section 1. Initialisation
C -----------------------------------------------------------------|
C
100 CONTINUE
C
IF( KPR.GE.1 ) CALL INTLOG(JP_DEBUG,'IGPOLEG: Section 1.',JPQUIET)
C
IGPOLEG = 0
C
IF( KPR.GE.1 ) THEN
CALL INTLOG(JP_DEBUG,'IGPOLEG: No. of input fld longs. = ',KIWE)
CALL INTLOG(JP_DEBUG,'IGPOLEG: No.of output fld longs. = ',KOWE)
ENDIF
C
C -----------------------------------------------------------------|
C* Section 2. Use average value for non-winds
C -----------------------------------------------------------------|
C
200 CONTINUE
C
IF( KPR.GE.1 ) CALL INTLOG(JP_DEBUG,'IGPOLEG: Section 2.',JPQUIET)
C
ZSUM = PPZERO
COUNT = 0
C
IF( LIMISSV ) THEN
DO JILON = 1, KIWE
IF( NOTEQ(PIFELD(JILON),RMISSGV) ) THEN
ZSUM = ZSUM + PIFELD(JILON)
COUNT = COUNT + 1
ENDIF
ENDDO
ELSE
DO JILON = 1, KIWE
ZSUM = ZSUM + PIFELD(JILON)
COUNT = COUNT + 1
ENDDO
ENDIF
C
IF( COUNT.GT.0 ) THEN
ZSUM = ZSUM / REAL(COUNT)
ELSE
ZSUM = RMISSGV
ENDIF
C
DO JOLON = 1, KOWE
POFELD(JOLON) = ZSUM
ENDDO
C
C -----------------------------------------------------------------|
C* Section 9. Return to calling routine. Format statements
C -----------------------------------------------------------------|
C
900 CONTINUE
C
IF( KPR.GE.1 ) CALL INTLOG(JP_DEBUG,'IGPOLEG: Section 9.',JPQUIET)
C
C
RETURN
END
|
