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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 HSP2GG2(KTRUNC,NS,EW,KGAUSS,KPTS,PLATS,KSIZE)
C
C---->
C**** HSP2GG2
C
C Purpose
C -------
C
C This routine finds a suitable gaussian grid for a given
C spectral truncation.
C
C
C Interface
C ---------
C
C IRET = HSP2GG2(KTRUNC,KGAUSS,KPTS,KSIZE)
C
C
C Input parameters
C ----------------
C
C KTRUNC - The spectral truncation
C
C
C Output parameters
C -----------------
C
C KGAUSS - The gaussian number
C KPTS - Array giving number of points along each line of latitude
C in the reduced gaussian grid (both hemispheres)
C PLATS - Array giving gaussian latitudes (both hemispheres)
C KSIZE - The number of points in the reduced gaussian grid
C
C Returns 0 if all OK, otherwise there is an error.
C
C
C Common block usage
C ------------------
C
C None
C
C
C Method
C ------
C
C None
C
C
C Externals
C ---------
C
C JGETGG - Reads the definition of a gaussian grid
C
C
C Reference
C ---------
C
C None.
C
C
C Comments
C --------
C
C None.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF February 2001
C
C
C Modifications
C -------------
C
C S.Curic ECMWF March 2005
C Added checking for a automatic trancation T255, T399, T799, T2047
C and corresponding gaussian grid.
C
C S.Curic ECMWF April 2008
C Added checking for a automatic trancation T1279
C and corresponding gaussian grid.
C
C
C S.Curic ECMWF Semptember 2009
C Match T255 and T213 against N128 instead of N160
C upon Alan Geer request
C
C----<
C -----------------------------------------------------------------|
C* Section 0. Definition of variables.
C -----------------------------------------------------------------|
C
IMPLICIT NONE
C
#include "parim.h"
C
C Function arguments
C
INTEGER KTRUNC, KGAUSS, KPTS(*), KSIZE
REAL NS, EW, STEP
REAL PLATS(*)
#include "jparams.h"
C
C Local variables
C
INTEGER LOOP, IRET
LOGICAL LDEBUG
C
C
C -----------------------------------------------------------------|
C Section 1. Initialise.
C -----------------------------------------------------------------|
STEP = MIN(ABS(NS),ABS(EW))
C
100 CONTINUE
C
HSP2GG2 = 0
c
CALL JDEBUG()
LDEBUG = ( NDBG.NE.0 )
C 2.5 and greater -> T63
C
IF( STEP.GE.2.5 ) THEN
KTRUNC = 63
KGAUSS = 48
GOTO 890
ENDIF
C
C 1.5 to 2.5 -> T106
C
IF( STEP.GE.1.5 ) THEN
KTRUNC = 106
KGAUSS = 80
GOTO 890
ENDIF
C
C 0.6 to 1.5 -> T213
C
IF( STEP.GE.0.6 ) THEN
KTRUNC = 213
KGAUSS = 128
GOTO 890
ENDIF
C
C 0.4 to 0.6 -> T319
C
IF( STEP.GE.0.4 ) THEN
KTRUNC = 319
KGAUSS = 160
GOTO 890
ENDIF
C
C 0.3 to 0.4 -> T511
C
IF( STEP.GE.0.3 ) THEN
KTRUNC = 511
KGAUSS = 256
GOTO 890
ENDIF
C
C 0.15 to 0.3 -> T799
C
IF( STEP.GE.0.15 ) THEN
KTRUNC = 799
KGAUSS = 400
GOTO 890
ENDIF
C
C 0.09 to 0.15 -> T1279
C
IF( STEP.GE.0.09 ) THEN
KTRUNC = 1279
KGAUSS = 640
GOTO 890
ENDIF
c
KTRUNC = 2047
KGAUSS = 1024
C
C Get the reduced gaussian grid information and count the
C number of points.
C
890 CONTINUE
CALL JGETGG(KGAUSS,'R',PLATS,KPTS,IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'HSP2GG2: JGETGG failed to get gaussian data',JPQUIET)
HSP2GG2 = 2
GOTO 900
ENDIF
C
KSIZE = 0
DO LOOP = 1, KGAUSS*2
KSIZE = KSIZE + KPTS(LOOP)
ENDDO
IF( LDEBUG ) THEN
CALL INTLOG(JP_DEBUG,
X 'HSP2GG2: Corresponding Spectral Truncation:',KTRUNC)
CALL INTLOG(JP_DEBUG,
X 'HSP2GG2: Corresponding Gaussian Number:',KGAUSS)
ENDIF
C
C -----------------------------------------------------------------|
C Section 9. Return.
C -----------------------------------------------------------------|
C
900 CONTINUE
C
RETURN
END
|
