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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 IGLGRID (KSTRIDE, KAREA, KLONG, KNWE, KLATG,
1 KNNS, OWEGLOBE, KPR, KERR)
C
C---->
C**** *IGLGRID*
C
C PURPOSE
C _______
C
C Generate the arrays of latitude and longitude points for a
C regular latitude longitude grid.
C
C INTERFACE
C _________
C
C IERR = IGLGRID (KSTRIDE, KAREA, KLONG, KNWE, KLATG, KNNS,
C 1 OWEGLOBE, KPR, KERR)
C
C Input parameters
C ________________
C
C KSTRIDE - The grid definition (WE, NS) provided by the
C calling routine.
C
C KAREA - The area definition (N, W, S, E) provided by the
C calling routine.
C
C KNWE - The number of points in the West-East direction in
C this field.
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 this is an input
C field.
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 KLONG - The array of longitudes for the stride and area.
C If OEWGLOBE is true the West-East field array has
C element KNWE + 1 set equal to element 1 to help
C with recognising where an output grid
C "wraps around" the break in the input grid.
C
C KLATG - The array of latitudes for the stride 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 arrays of longitudes and latitudes are generated using the
C information provided by the other parameters.
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* Oct 1993
C
C MODIFICATIONS
C _____________
C
C None
C
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
LOGICAL OWEGLOBE
INTEGER KNWE, KNNS, KPR, KERR
INTEGER KSTRIDE (2), KAREA (4)
INTEGER KLONG (KNWE + 1), KLATG (KNNS)
C
C Local variables
INTEGER IEAST, IWEST
INTEGER JLONG, JLAT
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 24900)
C
C _______________________________________________________
C
C* Section 1. Initialisation
C _______________________________________________________
C
100 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGLGRID: Section 1.',JPQUIET)
C
IGLGRID = 0
C
IF (KPR .GE. 1) THEN
CALL INTLOG(JP_DEBUG,'IGLGRID: Input parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG,'IGLGRID: No.long.pts = ',KNWE)
CALL INTLOG(JP_DEBUG,'IGLGRID: No.lat. pts = ',KNNS)
CALL INTLOG(JP_DEBUG,'IGLGRID: Grid stride WE = ',KSTRIDE(1))
CALL INTLOG(JP_DEBUG,'IGLGRID: Grid stride NS = ',KSTRIDE(2))
CALL INTLOG(JP_DEBUG,'IGLGRID: Area North = ', KAREA(1))
CALL INTLOG(JP_DEBUG,'IGLGRID: Area West = ', KAREA(2))
CALL INTLOG(JP_DEBUG,'IGLGRID: Area South = ', KAREA(3))
CALL INTLOG(JP_DEBUG,'IGLGRID: Area East = ', KAREA(4))
IF( OWEGLOBE ) THEN
CALL INTLOG(JP_DEBUG,
X 'IGLGRID: Input W-E fld is global.',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'IGLGRID: Input W-E fld is NOT global.',JPQUIET)
ENDIF
ENDIF
C
IEAST = KAREA (JPEAST)
IWEST = KAREA (JPWEST)
C
C _______________________________________________________
C
C
C* Section 2. Generate points around a line of latitude.
C _______________________________________________________
C
200 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGLGRID: Section 2.',JPQUIET)
C
C Standardise range so that EAST > WEST
C
IF (IEAST .LT. IWEST ) THEN
C
IF (IEAST .LT. 0) THEN
IEAST = IEAST + JP360
ELSE
IWEST = IWEST - JP360
ENDIF
C
ENDIF
C
C Generate points in standardised range (0, jp360)
C
DO 210 JLONG = 1, KNWE
C
KLONG (JLONG) = IWEST + KSTRIDE (JPWESTEP) * (JLONG - 1)
C
IF (KLONG (JLONG) .LT. 0)
1 KLONG (JLONG) = KLONG (JLONG) + JP360
C
210 CONTINUE
C
C Add first point to end of list if global
C
IF (OWEGLOBE)
1 KLONG (KNWE + 1) = KLONG (1)
C
C _______________________________________________________
C
C
C* Section 3. Generate points along a line of meridian
C _______________________________________________________
C
300 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGLGRID: Section 3.',JPQUIET)
C
DO 310 JLAT = 1, KNNS
C
KLATG (JLAT) = KAREA (JPNORTH) -
1 KSTRIDE (JPNSSTEP) * (JLAT - 1)
C
310 CONTINUE
C
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,'IGLGRID: Section 9.',JPQUIET)
C
RETURN
END
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