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C Copyright 1981-2016 ECMWF.
C
C This software is licensed under the terms of the Apache Licence
C Version 2.0 which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities
C granted to it by virtue of its status as an intergovernmental organisation
C nor does it submit to any jurisdiction.
C
INTEGER FUNCTION LSM_RED( KGAUSS, KDATE, KBITS, HPATH )
C
C---->
C**** LSM_RED
C
C PURPOSE
C -------
C
C Generates the land sea mask file pathname.
C
C
C INTERFACE
C ---------
C
C IRET = LSM_RED( KGAUSS, KDATE, KBITS, HPATH )
C
C
C Input
C -----
C KGAUSS - The gaussian number (80 or 160)
C KDATE - The data date in YYYYMMDD format.
C KBITS - Number of bits per land-sea mask value (eg 32 or 64)
C
C Output
C ------
C HPATH - The full file pathname (with gaussian number
C number of bits and date).
C
C
C Return value
C ------------
C
C Function returns the number of characters in the file pathname,
C or zero if no match found.
C
C
C Common block usage
C ------------------
C
C None
C
C
C EXTERNALS
C ---------
C
C GETENV - Standard routine to get environmental variable.
C INDEX - Intrinsic routine to find position of substring.
C EMOSNUM - Gives current EMOSLIB version number.
C
C
C METHOD
C ------
C None
C
C
C REFERENCE
C ---------
C
C None
C
C COMMENTS
C --------
C
C None
C
C
C AUTHOR
C ------
C
C J.D.Chambers *ECMWF* ??? 1996
C
C
C MODIFICATIONS
C -------------
C
C J.D.Chambers *ECMWF* July 1998
C Use dates in YYYYMMDD format to handle year 2000 etc.
C
C----<
C _______________________________________________________
C
C* Section 0. Definition of variables.
C _______________________________________________________
C
IMPLICIT NONE
C
C Parameters
C
INTEGER JPD160, JPD80
PARAMETER (JPD160=6)
PARAMETER (JPD80=2)
C
C Function parameters
C
INTEGER KGAUSS, KDATE, KBITS
CHARACTER*(*) HPATH
C
C Local variables
C
INTEGER LOOP
C
C External functions
C
INTEGER DPATH_TABLES_INTERPOL
EXTERNAL DPATH_TABLES_INTERPOL
C
C Change dates for N160
C
INTEGER DATE160(JPD160)
DATA DATE160/
X 19790930,
X 19910917,
X 19930804,
X 19940302,
X 19940823,
X 19950404
X /
C
C Change dates for N80
C
INTEGER DATE80(JPD80)
DATA DATE80/
X 19790930,
X 19790930
X /
C
CHARACTER*256 YBASE
INTEGER IBASELEN
CHARACTER*50 PATH160(JPD160)
CHARACTER*50 PATH80(JPD80)
C
C Pathnames for N160
C
DATA PATH160/
X '_19790930',
X '_19910917',
X '_19930804',
X '_19940302',
X '_19940823',
X '_19950404'
X /
C
C
C Pathnames for N80
DATA PATH80/
X '_19790930',
X '_19790930'
X /
C
INTEGER INDEX
C
C External functions
C
INTEGER EMOSNUM
EXTERNAL EMOSNUM
C
C***************************************************************
C Section 1. Initialize and check input values.
C***************************************************************
C
100 CONTINUE
C
LSM_RED = 0
HPATH = ' '
C
C Only reduced N160 gaussian fields handled.
C
IF( KGAUSS.NE.160 ) GOTO 900
C
C Only 32 bit and 64 bit land-sea masks handled.
C
IF( (KBITS.NE.32).AND.(KBITS.NE.64) ) GOTO 900
C
C Check environment variable for path of land sea masks.
C (no error is raised, since 0 is a possible resulting value)
C
IBASELEN = DPATH_TABLES_INTERPOL(YBASE)
C
C***************************************************************
C Section 2. Build pathnames.
C***************************************************************
C
200 CONTINUE
C
C Handle N160
C
IF( KGAUSS.EQ.160 ) THEN
DO 210 LOOP = 1, JPD160-1
IF( (KDATE.GE.DATE160(LOOP) ) .AND.
X (KDATE.LT.DATE160(LOOP+1)) ) THEN
HPATH(1:) = YBASE(1:IBASELEN) //
X 'r160_' // 'xx' // PATH160(LOOP)
LSM_RED = INDEX(HPATH,' ')
GOTO 900
ENDIF
210 CONTINUE
C
C Dropthrough -> take latest.
C
HPATH(1:) = YBASE(1:IBASELEN) //
X 'r160_' // 'xx' // PATH160(JPD160)
LSM_RED = INDEX(HPATH,' ')
C
C Handle N80
C
ELSE
DO 220 LOOP = 1, JPD80-1
IF( (KDATE.GE.DATE80(LOOP) ) .AND.
X (KDATE.LT.DATE80(LOOP+1)) ) THEN
HPATH(1:) = YBASE(1:IBASELEN) //
X 'r80_' // 'xx' // PATH80(LOOP)
LSM_RED = INDEX(HPATH,' ')
GOTO 900
ENDIF
220 CONTINUE
C
C Dropthrough -> take latest.
C
HPATH(1:) = YBASE(1:IBASELEN) //
X 'r80_' // 'xx' // PATH80(JPD80)
LSM_RED = INDEX(HPATH,' ')
ENDIF
C
C***************************************************************
C Section 9. Return.
C***************************************************************
C
900 CONTINUE
C
RETURN
END
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