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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 IRGRID (KAREA, KLLEN, KLN, PGAUSS, KSTART,
1 KLATG, KNNS, OWEGLOBE, KPR, KERR)
C
C---->
C**** *IRGRID*
C
C PURPOSE
C _______
C
C Generate the arrays of latitude points and the starting points
C of the lines of latitude for a quasi regular Gaussian grid.
C
C INTERFACE
C _________
C
C IERR = IRGRID (KAREA, KLLEN, KLN, PGAUSS, KSTART,
C 1 KLATG, KNNS, OWEGLOBE, KPR, KERR)
C
C Input parameters
C ________________
C
C KAREA - The area definition (N, W, S, E) provided by the
C calling routine. (Currently unused).
C
C KLLEN - This quasi regular Gaussian line length definition
C is for the full grid and not just the North and
C South limits selected.
C
C KLN - The Northern Gaussian latitude number for this area.
C
C PGAUSS - The full list of Gaussian latitudes for this
C truncation.
C
C KNNS - The number of points in the North-South direction
C in this field.
C
C OWEGLOBE - This variable will be true if the array of
C longitudes spans the globe and it is an input grid.
C (Currently unused)
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 KSTART - The array offset for each line of latitude within
C the quasi regular field.
C
C KLATG - The array of latitudes for this Gaussian
C truncation and area.
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 The array KLATG is generated using the information provided by
C the other parameters. The array KSTART is generated using the
C array KLLEN. Note that Gaussian latitudes will be stored as
C NINT (PGAUSS * 1.0E4).
C
C REFERENCE
C _________
C
C None
C
C COMMENTS
C ________
C
C Program contains sections 0 to 3 and 9
C
C AUTHOR
C ______
C
C K. Fielding *ECMWF* Nov 1993
C
C MODIFICATIONS
C _____________
C
C None
C
C----<
C _______________________________________________________
C
C* Section 0. Definition of variables.
C _______________________________________________________
C
IMPLICIT NONE
C
#include "parim.h"
#include "nifld.common"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 23700)
C
C Dummy arguments
C
LOGICAL OWEGLOBE
INTEGER KNNS, KLN, KPR, KERR
INTEGER KAREA (4), KLLEN (KNNS)
INTEGER KLATG (KNNS), KSTART (KNNS)
REAL PGAUSS (*)
C
C Local variables
C
LOGICAL LPRINT
INTEGER JLAT
REAL PNLAT, ZNLAT, MFACTOR
C
C Function externals
C
C _______________________________________________________
C
C* Section 1. Initialisation
C _______________________________________________________
C
100 CONTINUE
C
LPRINT = KPR.NE.0
C
IF( LPRINT ) CALL INTLOG(JP_DEBUG,'IRGRID: Section 1.',JPQUIET)
C
IRGRID = 0
C
IF( LPRINT ) THEN
CALL INTLOG(JP_DEBUG,'IRGRID: Input parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG,'IRGRID: N Gaussian line = ',KLN)
CALL INTLOG(JP_DEBUG,'IRGRID: No. of lat lines = ',KNNS)
CALL INTLOG(JP_DEBUG,'IRGRID: Area North = ', KAREA(1))
CALL INTLOG(JP_DEBUG,'IRGRID: Area West = ', KAREA(2))
CALL INTLOG(JP_DEBUG,'IRGRID: Area South = ', KAREA(3))
CALL INTLOG(JP_DEBUG,'IRGRID: Area East = ', KAREA(4))
IF( OWEGLOBE ) THEN
CALL INTLOG(JP_DEBUG,
X 'IRGRID: Input W-E fld is global.',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'IRGRID: Input W-E fld is NOT global.',JPQUIET)
ENDIF
ENDIF
C
C _______________________________________________________
C
C* Section 2. Generate start position of lines of latitude
C _______________________________________________________
C
200 CONTINUE
C
IF( LPRINT ) CALL INTLOG(JP_DEBUG,'IRGRID: Section 2.',JPQUIET)
C
KSTART(1) = 1
DO JLAT = KLN, KLN + KNNS - 2
KSTART(JLAT+1) = KSTART(JLAT) + KLLEN(JLAT)
ENDDO
C
C _______________________________________________________
C
C* Section 3. Generate points along a line of meridian
C _______________________________________________________
C
300 CONTINUE
C
IF( LPRINT ) CALL INTLOG(JP_DEBUG,'IRGRID: Section 3.',JPQUIET)
C
DO JLAT = KLN, KLN + KNNS - 1
C
C If it is a stretched field, calculate the true latitude and
C the map factor.
C
PNLAT = PGAUSS(JLAT)
IF( RISTRET.NE.0 ) THEN
CALL STRLAT(PNLAT, RISTRET, 0, ZNLAT, MFACTOR)
ELSE
ZNLAT = PNLAT
ENDIF
KLATG(JLAT-KLN+1) = NINT(ZNLAT * PPMULT)
ENDDO
KAREA(1) = KLATG(1)
KAREA(KLN) = KLATG(KLN)
IF( LPRINT ) THEN
CALL INTLOG(JP_DEBUG,'IRGRID: Modified North = ', KAREA(1))
CALL INTLOG(JP_DEBUG,'IRGRID: Modified South = ', KAREA(3))
ENDIF
C
C _______________________________________________________
C
C* Section 9. Return to calling routine. Format statements
C _______________________________________________________
C
900 CONTINUE
C
IF( LPRINT ) CALL INTLOG(JP_DEBUG,'IRGRID: Section 9.',JPQUIET)
C
RETURN
END
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