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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 IGLSMR (KILSMN, KILSMS, KOLSM, KNINDEX,
1 KSINDEX, KOWE, PWFACT, KPR, KERR)
C
C---->
C**** *IGLSMR*
C
C PURPOSE
C _______
C
C Calculate the effects of the land sea masks for one line of
C latitude on the unnormalised interpolation weights.
C
C INTERFACE
C _________
C
C IERR = IGLSMR (KILSMN, KILSMS, KOLSM, KNINDEX, KSINDEX,
C 1 KOWE, PWFACT, KPR, KERR)
C
C Input parameters
C ________________
C
C KILSMN - The land sea mask for the line of latitude of the
C input field North of the output row.
C
C KILSMS - The land sea mask for the line of latitude of the
C input field South of the output row.
C
C KOLSM - The land sea mask for the current line of latitude
C of the output field.
C
C KNINDEX - This array contains the array offsets of the West
C and East points in the input line of latitude North
C of the current output field line of latitude.
C
C KSINDEX - This array contains the array offsets of the West
C and East points in the input line of latitude South
C of the current output field line of latitude.
C
C KOWE - The number of output field points in the West-East
C direction for this line of latitude.
C
C PWFACT - The array of interpolating weights to the four
C neighbouring points for every output point in this
C line of latitude.
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 PWFACT - The modified array of interpolating weights to the
C four neighbouring points for every output point in
C this line of latitude.
C
C Return value
C ____________
C
C The error indicator (INTEGER).
C
C Error and Warning Return Values
C _______________________________
C
C None
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 Every time that a point in the input array has a land-sea mask
C value (0-1) that does not match the corresponding output point
C its interpolating value is multiplied by a scaling factor
C (currently 0.2). This reduces the influence of such points on
C the final interpolation.
C
C The parameter list is designed to allow for quasi regular input
C fields with different grid spacing in the Northern and Southern
C lines of latitude.
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 None
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
INTEGER KOWE, KPR, KERR
INTEGER KNINDEX (2, KOWE), KSINDEX (2, KOWE)
INTEGER KILSMN (*), KILSMS (*), KOLSM (KOWE)
REAL PWFACT (4, KOWE)
C
C Local variables
INTEGER JOLON
C
C Multiplication factor for unlike land-sea masks
REAL PPLSM
PARAMETER (PPLSM = 0.2E0)
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 25300)
C
C _______________________________________________________
C
C* Section 1. Initialisation
C _______________________________________________________
C
100 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGLSMR: Section 1.',JPQUIET)
C
IGLSMR = 0
C
IF (KPR .GE. 1)
X CALL INTLOG(JP_DEBUG,'IGLSMR: No. of output longitudes = ',KOWE)
C
C _______________________________________________________
C
C* Section 2. Calculate arrays of weights
C _______________________________________________________
C
200 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGLSMR: Section 2.',JPQUIET)
C
C Now modify the unormalised weight for land-sea mask
C
DO 210 JOLON = 1, KOWE
C
IF (KILSMN (KNINDEX (JP_I_W, JOLON)) .NE.
1 KOLSM (JOLON) )
2 PWFACT (JP_I_NW, JOLON) =
3 PWFACT (JP_I_NW, JOLON) * PPLSM
C
IF (KILSMN (KNINDEX (JP_I_E, JOLON)) .NE.
1 KOLSM (JOLON) )
2 PWFACT (JP_I_NE, JOLON) =
3 PWFACT (JP_I_NE, JOLON) * PPLSM
C
IF (KILSMS (KSINDEX (JP_I_W, JOLON)) .NE.
1 KOLSM (JOLON) )
2 PWFACT (JP_I_SW, JOLON) =
3 PWFACT (JP_I_SW, JOLON) * PPLSM
C
IF (KILSMS (KSINDEX (JP_I_E, JOLON)) .NE.
1 KOLSM (JOLON) )
2 PWFACT (JP_I_SE, JOLON) =
3 PWFACT (JP_I_SE, JOLON) * PPLSM
C
210 CONTINUE
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,'IGLSMR: Section 9.',JPQUIET)
C
RETURN
END
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