1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
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 MAKERL(SHCIN,KTRUNC,SHCOUT,RANGLES)
C
C---->
C**** MAKERL
C
C Purpose
C -------
C
C Rotates a spherical harmonic field.
C
C
C Interface
C ---------
C
C IRET = MAKERL(SHCIN,KTRUNC,SHCOUT,RANGLES)
C
C Input
C -----
C
C SHCIN - Input array of spherical harmonics.
C KTRUNC - Truncation of the spherical harmonics.
C RANGLES - Coordinates of the south pole of rotation:
C latitude/longitude.
C
C
C Output
C ------
C
C SHCOUT - Output array of rotated spherical harmonics.
C
C Function returns 0 if all OK, otherwise the rotations failed.
C
C
C Method
C ------
C
C None.
C
C
C Externals
C ---------
C
C RPHI - Rotates spectral coefficients by longitude.
#ifdef __uxp__
C JACOBIF - Rotates spectral coefficients by latitude.
#else
C JACOBI - Rotates spectral coefficients by latitude.
#endif
C INTLOG - Logs messages.
C
C Author
C ------
C
C J.D.Chambers ECMWF October, 1995.
C
C
C----<
C---------------------------------------------------------------------
C
C
IMPLICIT NONE
#include "parim.h"
#include "nofld.common"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 28300)
INTEGER JPLEN, JPNM
PARAMETER ( JPNM = JPSTRUNC )
PARAMETER ( JPLEN = (JPNM+1)*(JPNM+2) )
C
C Function arguments.
C
REAL SHCIN, SHCOUT, RANGLES
DIMENSION SHCIN(*), SHCOUT(*), RANGLES(*)
INTEGER KTRUNC
C
C Local variables
C
REAL*8 DLON, DLAT
REAL*8 WORK
DIMENSION WORK(2*(JPNM+1)*(JPNM+6))
LOGICAL LOK
INTEGER NBYTES, LOOP
#if (defined CRAY) || (defined REAL_8)
DATA NBYTES/8/
#else
DATA NBYTES/4/
REAL*8 DATA
DIMENSION DATA(JPLEN)
#endif
C
C Externals
C
#ifdef __uxp__
LOGICAL JACOBIF
EXTERNAL JACOBIF
#else
LOGICAL JACOBI
EXTERNAL JACOBI
#endif
C
C _______________________________________________________
C
C* Section 1. Initialise.
C _______________________________________________________
C
100 CONTINUE
C
MAKERL = 0
C
C Check truncation not too big to handle.
C
IF( KTRUNC .GT. JPSTRUNC ) THEN
CALL INTLOG(JP_FATAL,'MAKERL: Truncation max exceeded', JPQUIET)
CALL INTLOG(JP_FATAL,'MAKERL: Truncation = ', KTRUNC)
CALL INTLOG(JP_FATAL,'MAKERL: Allowed maximum = ', JPSTRUNC)
MAKERL = JPROUTINE + 1
GOTO 900
ENDIF
C
C _______________________________________________________
C
C* Section 2. Rotate the spectral coefficients.
C _______________________________________________________
C
200 CONTINUE
C
#if (defined CRAY) || (defined REAL_8)
DLAT = -90.0 - RANGLES(1)
DLON = -RANGLES(2)
C
C Rotate the spectral field by longitude.
C Positive DLON => frame rotated from west to east.
C
DO 210 LOOP = 1, (KTRUNC+1)*(KTRUNC+2)
SHCOUT(LOOP) = SHCIN(LOOP)
210 CONTINUE
CALL RPHI( SHCOUT, KTRUNC, WORK, DLON)
C
C Rotate the spectral field by latitude.
C Negative DLAT => rotate counter-clockwise about new polar axis.
C
#if (defined __uxp__)
LOK = JACOBIF( SHCOUT, KTRUNC, WORK, DLAT)
#else
LOK = JACOBI( SHCOUT, KTRUNC, WORK, DLAT)
#endif
IF(.NOT.LOK) THEN
CALL INTLOG(JP_FATAL,'MAKERL: JACOBI failed.', JPQUIET)
MAKERL = JPROUTINE + 2
GOTO 900
ENDIF
#else
DLAT = -90.0 - DBLE(RANGLES(1))
DLON = -DBLE(RANGLES(2))
C
C Expand spectral coefficients to REAL*8
C
DO 210 LOOP = 1, (KTRUNC+1)*(KTRUNC+2)
DATA(LOOP) = DBLE(SHCIN(LOOP))
210 CONTINUE
C
C Rotate the spectral field by longitude.
C Positive DLON => frame rotated from west to east.
C
CALL RPHI( DATA, KTRUNC, WORK, DLON)
C
C Rotate the spectral field by latitude.
C Negative DLAT => rotate counter-clockwise about new polar axis.
C
#if (defined __uxp__)
LOK = JACOBIF( DATA, KTRUNC, WORK, DLAT)
#else
LOK = JACOBI( DATA, KTRUNC, WORK, DLAT)
#endif
IF(.NOT.LOK) THEN
CALL INTLOG(JP_FATAL,'MAKERL: JACOBI failed.', JPQUIET)
MAKERL = JPROUTINE + 2
GOTO 900
ENDIF
C
C Repack spectral coefficients to REAL*4.
C
DO 220 LOOP = 1, (KTRUNC+1)*(KTRUNC+2)
SHCOUT(LOOP) = SNGL(DATA(LOOP))
220 CONTINUE
#endif
C
C _______________________________________________________
C
C* Section 9. Return.
C _______________________________________________________
C
900 CONTINUE
C
RETURN
END
|
