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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 IRLSMB (OISTAND, HIFILE, KIREC, KIGRID, KILINE,
X OOSTAND, HOFILE, KOREC, KOGRID, KOLINE, KPR, KERR)
C
C---->
C**** *IRLSMB*
C
C Purpose
C -------
C
C Calculate the effects of the land-sea masks on the unnormalised
C interpolation weights for a quasi regular input field and a
C regular output field.
C
C
C Interface
C ---------
C
C IERR = IRLSMB (OISTAND, HIFILE, KIREC, KIGRID, KILINE,
C X OOSTAND, HOFILE, KOREC, KOGRID, KOLINE, KPR, KERR)
C
C
C Input parameters
C ----------------
C
C OISTAND - Flag indicating whether the input land-sea mask
C is a pre-stored "standard" field.
C
C HIFILE - The filename for the input land-sea mask.
C
C KIREC - The length of one latitude record in the input file.
C
C KIGRID - An array of length 2 giving the row and column
C strides in a pre-stored land sea mask file for the
C input grid.
C
C KILINE - An array of length 2 giving the offsets of the
C Northern and Western starting points in a
C pre-stored land sea mask file for the input grid.
C
C OOSTAND - Flag indicating whether the output land-sea mask
C is a prestored "standard" field.
C
C HOFILE - The filename for the output land-sea mask.
C
C KOREC - The length of one latitude record in the output file.
C
C KOGRID - An array of length 2 giving the row and column
C strides in a pre-stored land sea mask file for the
C output grid.
C
C KOLINE - An array of length 2 giving the offsets of the
C Northern and Western starting points in a
C pre-stored land sea mask file for the output grid.
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
C Output parameters
C -----------------
C
C The common variable WFACT is modified by this routine.
C
C An error indicator
C
C 23401 An error exit was returned from the I/O routine PBOPEN.
C 23402 An error exit was returned from the I/O routine PBCLOSE.
C
C
C Common block usage
C ------------------
C
C nifld.common - This file contains all the input field
C definition variables.
C
C NINS - Number of grid points in NS direction for input
C field (used in grspace.h).
C NIWE - Number of grid points in WE direction for input
C field (used in grspace.h).
C
C nofld.common - This file contains all the output field
C definition variables.
C
C NONS - Number of grid points in NS direction for output
C field is used.
C NOWE - Number of grid points in WE direction for output
C field is used.
C
C grspace.h - This file contains all the work space array
C definitions for grid point to grid point
C interpolation.
C
C MEXPAND - Array used to expand one latitude line of the
C 10 minute land sea mask file to have one word
C per bit for improved efficiency.
C MILLEN - Array containing a quasi regular line length
C definition.
C MWORK - Array used to read one latitude line of a
C standard land sea mask file.
C
C MILATG - The input field latitudes.
C MILONG - The input field longitudes.
C MILSM - Work array used in calculating the effects of
C the land sea mask on interpolation.
C MISTRT - The array offsets of the start of each latitude
C line for a quasi regular Gaussian input field.
C MNSIND - The latitude line numbers (array offset) of the
C input field associated with each line of
C latitude in the output field.
C MOLATG - The output field latitudes.
C MOLONG - The output field longitudes.
C MOLSM - Work array used in calculating the effects of
C the land sea mask on interpolation.
C MWEIND - This array holds the longitude points (array
C offset) from the input field associated with
C each longitude point in the output field.
C WFACT - The interpolation weights for each point in the
C output field.
C
C
C Externals
C ---------
C
C IGLSM01 - Read and process one latitude row from the 10
C minute land sea mask.
C IGLSMR - Calculate the effects of the land-sea masks for
C one line of latitude on the unnormalised
C interpolation weights.
C IGLSMST - Read and process one line of latitude from a
C standard land sea mask file.
C PBCLOSE - Close a land sea mask file after processing.
C PBOPEN - Open a land sea mask file for processing.
C INTLOG(R) - Log messages.
C JINDEX - Returns length of character string
C
C
C Method
C ------
C
C All the land sea mask data is in (0-1) form. If a point in the
C input field has a different land sea mask value from the
C corresponding point in the output field then its interpolating
C weight is multiplied by a scaling factor. This scaling factor
C is currently 0.2 so that the effect of such points in the final
C interpolation is reduced.
C
C The land-sea mask files are kept open between calls to this
C routine.
C
C
C Reference
C ---------
C
C None
C
C
C Comments
C --------
C
C None
C
C
C Author
C ------
C K. Fielding *ECMWF* Nov 1993
C
C Modifications
C -------------
C
C J.D.Chambers ECMWF Oct 1996
C Reduced number of parameters in call to IGLSMST and IGLSM01
C
C----<
C -----------------------------------------------------------------|
C* Section 0. Definition of variables.
C -----------------------------------------------------------------|
C
IMPLICIT NONE
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grspace.h"
C
C Function arguments
C
LOGICAL OISTAND, OOSTAND
CHARACTER *(*) HIFILE, HOFILE
INTEGER KIREC, KOREC, KPR, KERR
INTEGER KIGRID (2), KILINE (2), KOGRID (2), KOLINE (2)
C
C Local variables
C
INTEGER IIUNIT, IOUNIT, IIFILE, IOFILE
INTEGER ILATN, ILATS, ILINEN, ILINES, ISTRIDEN, ISTRIDES
INTEGER IOSTRIDE, INDEXN, INDEXS, IZERO, IOFF, IPR, IERR
INTEGER JLON, JOLAT
CHARACTER*80 XHIFILE, XHOFILE
CHARACTER*2 NEWFILE, MSKFILE
INTEGER XIIUNIT, XIOUNIT, II
DATA XIIUNIT/0/
DATA XIOUNIT/0/
SAVE XHIFILE, XHOFILE, XIIUNIT, XIOUNIT
C
C Multiplication factor for unlike land-sea masks
C
REAL PPLSM
PARAMETER (PPLSM = 0.2E0)
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 23400)
C
C External functions
C
INTEGER IGLSMR, IGLSMST, IGLSM01, JINDEX
C
C -----------------------------------------------------------------|
C* Section 1. Initialisation
C -----------------------------------------------------------------|
C
100 CONTINUE
C
IF( KPR.GE.1 ) CALL INTLOG(JP_DEBUG,'IRLSMB: Section 1.',JPQUIET)
C
IRLSMB = 0
C
IIFILE = JINDEX(HIFILE)
IOFILE = JINDEX(HOFILE)
C
IF( KPR.GE.1 ) THEN
CALL INTLOG(JP_DEBUG,'IRLSMB: Input field parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG,'IRLSMB: LSM filename is.',JPQUIET)
CALL INTLOG(JP_DEBUG, HIFILE(1:IIFILE), JPQUIET)
IF( OISTAND ) THEN
CALL INTLOG(JP_DEBUG,'IRLSMB: Standard fld: TRUE',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,'IRLSMB: Standard fld: FALSE',JPQUIET)
ENDIF
CALL INTLOG(JP_DEBUG,'IRLSMB: LSM file rec len = ',KIREC)
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid stride WE = ',KIGRID(1))
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid stride NS = ',KIGRID(2))
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid start N = ',KILINE(1))
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid start W = ',KILINE(2))
C
CALL INTLOG(JP_DEBUG,'IRLSMB: Output field parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG, HOFILE(1:IOFILE),JPQUIET)
IF( OOSTAND ) THEN
CALL INTLOG(JP_DEBUG,'IRLSMB: Standard fld: TRUE',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,'IRLSMB: Standard fld: FALSE',JPQUIET)
ENDIF
CALL INTLOG(JP_DEBUG,'IRLSMB: LSM file rec len = ',KOREC)
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid stride WE = ',KOGRID(1))
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid stride NS = ',KOGRID(2))
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid start N = ',KOLINE(1))
CALL INTLOG(JP_DEBUG,'IRLSMB: Grid start W = ',KOLINE(2))
ENDIF
C
IF( MOLONG(2).GE.MOLONG(1) ) THEN
IOSTRIDE = MOLONG(2) - MOLONG(1)
ELSE
IOSTRIDE = MOLONG(2) + JP360 - MOLONG(1)
ENDIF
C
C -----------------------------------------------------------------|
C* Section 2. Open files for input and output land sea masks
C -----------------------------------------------------------------|
C
200 CONTINUE
C
IF( KPR.GE.1 ) CALL INTLOG(JP_DEBUG,'IRLSMB: Section 2.',JPQUIET)
C
C See if first time through or input land sea mask filename has
C changed since last access
C
II = JINDEX(HIFILE)
IF( XHIFILE(1:II).NE.HIFILE(1:II) ) THEN
C
C Open input land sea mask file
C
IF(XIIUNIT.NE.0) CALL PBCLOSE(XIIUNIT,IERR)
CALL PBOPEN(IIUNIT, HIFILE, 'r', IERR)
IF( IERR.NE.0 ) THEN
IRLSMB = JPROUTINE + 1
C
IF( KERR.GE.0 ) THEN
CALL INTLOG(JP_ERROR,'IRLSMB: PBOPEN return code = ',IERR)
CALL INTLOG(JP_ERROR,'IRLSMB: trying to open file',JPQUIET)
CALL INTLOG(JP_ERROR, HIFILE(1:IIFILE),JPQUIET)
ENDIF
C
IF( KERR.EQ.0 ) CALL INTLOG(JP_FATAL,
X 'IRLSMB: Interpolation failed.',JPQUIET)
GOTO 900
ENDIF
XIIUNIT = IIUNIT
XHIFILE(1:II) = HIFILE(1:II)
NEWFILE(1:1) = 'Y'
C
C Just rewind if same file still in use
C
ELSE
IIUNIT = XIIUNIT
NEWFILE(1:1) = 'N'
ENDIF
C
C See if first time through or output land sea mask filename has
C changed since last access
C
II = JINDEX(HOFILE)
IF( XHOFILE(1:II).NE.HOFILE(1:II) ) THEN
C
C Open output land sea mask file
C
IF(XIOUNIT.NE.0) CALL PBCLOSE(XIOUNIT,IERR)
CALL PBOPEN(IOUNIT, HOFILE, 'r', IERR)
IF( IERR.NE.0 ) THEN
IRLSMB = JPROUTINE + 1
C
IF( KERR.GE.0 ) THEN
CALL INTLOG(JP_ERROR,'IRLSMB: PBOPEN return code = ',IERR)
CALL INTLOG(JP_ERROR,'IRLSMB: trying to open file',JPQUIET)
CALL INTLOG(JP_ERROR, HOFILE(1:IOFILE),JPQUIET)
ENDIF
C
IF( KERR.EQ.0 ) CALL INTLOG(JP_FATAL,
X 'IRLSMB: Interpolation failed.',JPQUIET)
GOTO 900
ENDIF
XIOUNIT = IOUNIT
XHOFILE(1:II) = HOFILE(1:II)
NEWFILE(2:2) = 'Y'
C
C Just rewind if same file still in use
C
ELSE
IOUNIT = XIOUNIT
NEWFILE(2:2) = 'N'
ENDIF
C
C -----------------------------------------------------------------|
C* Section 3. Calculate arrays of weights
C -----------------------------------------------------------------|
C
300 CONTINUE
C
IF( KPR.GE.1 ) CALL INTLOG(JP_DEBUG,'IRLSMB: Section 3.',JPQUIET)
C
IPR = KPR
C
DO JOLAT = 1, NONS
C
INDEXN = ( (JOLAT - 1) * 2 + JP_I_N - 1) * NOWE + 1
INDEXS = ( (JOLAT - 1) * 2 + JP_I_S - 1) * NOWE + 1
C
C Get line for output array
C
IF( OOSTAND ) THEN
C
IOFF = (KOLINE(JPNORTH) + (JOLAT - 1) * KOGRID(JPNSSTEP)
X - 1) * KOREC
C
MSKFILE(2:2) = 'O'
MSKFILE(1:1) = NEWFILE(2:2)
IERR = IGLSMST(IOUNIT, IOFF, NOWE, KOLINE(JPWEST),
X KOGRID(JPWESTEP), KOREC, MOLSM, MSKFILE)
NEWFILE(2:2) = 'N'
C
ELSE
IERR = IGLSM01(IOUNIT, NOWE, MOLONG, MOLATG(JOLAT),
X MEXPAND, KOREC, MOLSM)
ENDIF
C
IF( IERR.GT.0 ) THEN
IRLSMB = IERR
GOTO 900
ENDIF
C
ILATN = MNSIND(JP_I_N, JOLAT)
ILATS = MNSIND(JP_I_S, JOLAT)
C
ILINEN = MILLEN(ILATN)
ISTRIDEN = JP360 / ILINEN
C
ILINES = MILLEN(ILATS)
ISTRIDES = JP360 / ILINES
C
IZERO = 0
C
C Get lines for input array
C
IF( OISTAND ) THEN
C
MSKFILE(2:2) = 'I'
MSKFILE(1:1) = NEWFILE(1:1)
IERR = IGLSMST(IIUNIT, MISTRT(ILATN) - 1, ILINEN,
X KILINE(JPWEST), KIGRID(JPWESTEP), ILINEN,
X MILSM(1, JP_I_N), MSKFILE)
NEWFILE(1:1) = 'N'
C
IF( IERR.GT.0 ) THEN
IRLSMB = IERR
GOTO 900
ENDIF
C
MSKFILE(2:2) = 'I'
MSKFILE(1:1) = NEWFILE(1:1)
IERR = IGLSMST(IIUNIT, MISTRT(ILATS) - 1, ILINES,
X KILINE(JPWEST), KIGRID(JPWESTEP), ILINES,
X MILSM(1, JP_I_S), MSKFILE)
NEWFILE(1:1) = 'N'
C
ELSE
C
DO JLON = 0, ILINEN - 1
MILONG(JLON + 1) = ISTRIDEN * JLON
ENDDO
C
IERR = IGLSM01(IIUNIT, ILINEN, MILONG, MILATG(ILATN),
X MEXPAND, KIREC, MILSM(1, JP_I_N))
C
IF( IERR.GT.0 ) THEN
IRLSMB = IERR
GOTO 900
ENDIF
C
DO JLON = 0, ILINES - 1
MILONG(JLON + 1) = ISTRIDES * JLON
ENDDO
C
IERR = IGLSM01(IIUNIT, ILINES, MILONG, MILATG(ILATS),
X MEXPAND, KIREC, MILSM(1, JP_I_S))
C
ENDIF
C
IF( IERR.GT.0 ) THEN
IRLSMB = IERR
GOTO 900
ENDIF
C
C Now modify the unormalised weight for land-sea mask
C
IERR = IGLSMR(MILSM(1, JP_I_N), MILSM(1, JP_I_S),
X MOLSM, MWEIND(1, INDEXN), MWEIND(1, INDEXS), NOWE,
X WFACT(1,(JOLAT - 1) * NOWE + 1), IPR, KERR)
C
IF( IERR.GT.0 ) THEN
IRLSMB = IERR
GOTO 900
ENDIF
C
IPR = KPR - 1
C
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,'IRLSMB: Section 9.',JPQUIET)
C
RETURN
END
|
