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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 IGSCAN (PMAT, KNWE, KNNS, KSCAN, OINFIELD,
1 KPR, KERR)
C
C---->
C**** *IGSCAN*
C
C PURPOSE
C _______
C
C Transform a regular field between the specified external
C scanning mode and a standard internal scanning mode.
C
C INTERFACE
C _________
C
C IERR = IGSCAN (PMAT, KNWE, KNNS, KSCAN, OINFIELD, KPR, KERR)
C
C Input parameters
C ________________
C
C PMAT - The input matrix of dimension (KNWE * KNNS).
C
C KNWE - The number of points in the West-East direction.
C
C KNNS - The number of points in the North-South direction.
C
C KSCAN - A standard GRIB byte variable with bits 1 to 3
C separately significant. This means that the final
C value is the sum of the bit settings.
C
C 128 , Set if points scan East to West.
C 64 , Set if points scan South to North.
C 32 , Set if points in the North South direction
C are consecutive.
C
C OINFIELD - Flag variable which is TRUE for an input field and
C FALSE for an output field.
C This determines the order in which the
C transformations are applied.
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 PMAT - The transposed matrix.
C
C Return value
C ____________
C
C The error indicator (INTEGER).
C
C Error and Warning Return Values
C _______________________________
C
C 7101 The scanning mode was not in the range 0 to 255.
C
C Common block usage
C __________________
C
C None
C
C EXTERNALS
C _________
C
C ABORTX - Standard routine to kill task.
C IGTRAN - Routine to transpose a rectangular matrix.
C IGLREV - Routine to reverse the elements within each row or
C each column of a rectangular matrix.
C INTLOG - Logs messages.
C
C METHOD
C ______
C
C KSCAN = 128 is implemented by swapping elements within each
C column of the matrix.
C
C KSCAN = 64 is implemented by reversing the order of the columns.
C
C KSCAN = 32 is implemented by transposing the matrix.
C
C An input matrix is transposed before the two reversal stages
C are performed.
C
C An output matrix has the matrix transposition as the final step.
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* Jan 1994
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
C
LOGICAL OINFIELD
C
INTEGER KNWE, KNNS, KSCAN, KPR, KERR
C
REAL PMAT (KNWE * KNNS)
C
C Local variables
C
LOGICAL GNSMOD, GWEMOD, GTRMOD
C
INTEGER ISCAN, IDIR, IERR
C
INTEGER JPMOVE
PARAMETER (JPMOVE = (JPLAT + JPLONG) / 2)
C
INTEGER IMOVE (JPMOVE)
C
INTEGER JPROUTINE
C
PARAMETER (JPROUTINE = 7100)
C
C External functions
C
INTEGER IGTRAN, IGLREV
C
C _______________________________________________________
C
C
C* Section 1. Initialisation - Evaluate scan modes
C _______________________________________________________
C
100 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGSCAN: Section 1.',JPQUIET)
C
IGSCAN = 0
C
IF (KPR .GE. 1) THEN
CALL INTLOG(JP_DEBUG,'IGSCAN: Input parameters',JPQUIET)
CALL INTLOG(JP_DEBUG,'IGSCAN: Longitude points are ',KNWE)
CALL INTLOG(JP_DEBUG,'IGSCAN: Latitude lines are ',KNNS)
CALL INTLOG(JP_DEBUG,'IGSCAN: Scan mode is ',KSCAN)
IF ( OINFIELD ) THEN
CALL INTLOG(JP_DEBUG,
X 'IGSCAN: Input field transformation is TRUE',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'IGSCAN: Input field transformation is FALSE',JPQUIET)
ENDIF
ENDIF
C
IF (KSCAN .LT. 0 .OR. KSCAN .GE. 256) THEN
IGSCAN = JPROUTINE + 1
IF (KERR .GE. 0) CALL INTLOG(JP_ERROR,
X 'IGSCAN: Scan mode is not in range 0 to 255 = ',KSCAN)
IF (KERR .EQ. 0) CALL INTLOG(JP_FATAL,
X 'IGSCAN: Interpolation fails.',IGSCAN)
GO TO 900
ENDIF
C
C Zero KSCAN means no transformation
C
IF (KSCAN .EQ. 0) GO TO 900
C
ISCAN = KSCAN
GWEMOD = .FALSE.
GNSMOD = .FALSE.
C
IF (ISCAN .GE. 128) THEN
ISCAN = ISCAN - 128
GWEMOD = .TRUE.
ENDIF
C
IF (ISCAN .GE. 64) THEN
ISCAN = ISCAN - 64
GNSMOD = .TRUE.
ENDIF
C
GTRMOD = ISCAN .GE. 32
C
C _______________________________________________________
C
C* Section 2. Input field
C
C Potential operations in order are
C
C 1 Transpose matrix
C 2 Modify West East mode
C 3 Modify North South mode
C _______________________________________________________
C
200 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGSCAN: Section 2.',JPQUIET)
C
IF (OINFIELD) THEN
C
IF (GTRMOD) THEN
C
IERR = IGTRAN (PMAT, KNNS, KNWE, IMOVE, JPMOVE, KPR, KERR)
C
IF (IERR .NE. 0) THEN
IGSCAN = IERR
GO TO 900
ENDIF
C
ENDIF
C
IF (GWEMOD) THEN
C
IDIR = 1
C
IERR = IGLREV (PMAT, KNWE, KNNS, IDIR, KPR, KERR)
C
IF (IERR .NE. 0) THEN
IGSCAN = IERR
GO TO 900
ENDIF
C
ENDIF
C
IF (GNSMOD) THEN
C
IDIR = 2
C
IERR = IGLREV (PMAT, KNWE, KNNS, IDIR, KPR, KERR)
C
IF (IERR .NE. 0) THEN
IGSCAN = IERR
GO TO 900
ENDIF
C
ENDIF
C
ELSE
C
C _______________________________________________________
C
C* Section 3. Output field
C
C Potential operations in order are
C
C 1 Modify West East mode
C 2 Modify North South mode
C 3 Transpose matrix
C _______________________________________________________
C
300 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGSCAN: Section 3.',JPQUIET)
C
IF (GWEMOD) THEN
C
IDIR = 1
C
IERR = IGLREV (PMAT, KNWE, KNNS, IDIR, KPR, KERR)
C
IF (IERR .NE. 0) THEN
IGSCAN = IERR
GO TO 900
ENDIF
C
ENDIF
C
IF (GNSMOD) THEN
C
IDIR = 2
C
IERR = IGLREV (PMAT, KNWE, KNNS, IDIR, KPR, KERR)
C
IF (IERR .NE. 0) THEN
IGSCAN = IERR
GO TO 900
ENDIF
C
ENDIF
C
IF (GTRMOD) THEN
C
IERR = IGTRAN (PMAT, KNWE, KNNS, IMOVE, JPMOVE, KPR, KERR)
C
IF (IERR .NE. 0) THEN
IGSCAN = IERR
GO TO 900
ENDIF
C
ENDIF
C
ENDIF
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,'IGSCAN: Section 9.',JPQUIET)
C
RETURN
END
|
