/[MITgcm]/MITgcm/pkg/zonal_filt/zonal_filt_presmooth.F
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Contents of /MITgcm/pkg/zonal_filt/zonal_filt_presmooth.F

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Revision 1.4 - (show annotations) (download)
Tue Apr 10 22:35:27 2001 UTC (23 years, 8 months ago) by heimbach
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint51k_post, checkpoint62v, checkpoint47e_post, checkpoint57m_post, checkpoint52l_pre, checkpoint44e_post, checkpoint62u, hrcube4, hrcube5, checkpoint46l_post, checkpoint57g_pre, checkpoint46g_pre, checkpoint47c_post, release1_p13_pre, checkpoint62t, checkpoint50c_post, checkpoint57s_post, checkpoint58b_post, checkpoint57b_post, checkpoint46f_post, checkpoint52d_pre, checkpoint57g_post, checkpoint48e_post, checkpoint56b_post, checkpoint50c_pre, checkpoint57y_post, checkpoint44f_post, checkpoint46b_post, checkpoint52j_pre, checkpoint43a-release1mods, checkpoint51o_pre, checkpoint65z, checkpoint65x, checkpoint65y, checkpoint54d_post, checkpoint65r, checkpoint65s, checkpoint65p, checkpoint65q, checkpoint65v, checkpoint65w, checkpoint65t, checkpoint65u, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint54e_post, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint40pre3, checkpoint62c, checkpoint40pre1, checkpoint51l_post, checkpoint40pre7, checkpoint40pre6, checkpoint48i_post, checkpoint57r_post, checkpoint40pre9, checkpoint40pre8, checkpoint46l_pre, checkpoint57d_post, checkpoint57i_post, checkpoint52l_post, checkpoint52k_post, chkpt44d_post, checkpoint59, checkpoint58, checkpoint55, checkpoint54, checkpoint57, checkpoint56, checkpoint51, checkpoint50, checkpoint53, checkpoint52, release1_p8, release1_p9, checkpoint50d_post, release1_p1, release1_p2, release1_p3, release1_p4, release1_p5, release1_p6, release1_p7, checkpoint58f_post, checkpoint52f_post, checkpoint57n_post, checkpoint58d_post, checkpoint62s, checkpoint58a_post, checkpoint62r, checkpoint62q, checkpoint50b_pre, checkpoint44e_pre, checkpoint62p, checkpoint57z_post, checkpoint54f_post, checkpoint51f_post, checkpoint62a, release1_b1, checkpoint62g, checkpoint62f, checkpoint62e, checkpoint62d, checkpoint62k, checkpoint62j, checkpoint62i, checkpoint62h, checkpoint62o, checkpoint62n, checkpoint62m, checkpoint62l, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, checkpoint62w, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint62z, checkpoint62y, checkpoint62x, checkpoint58y_post, checkpoint48b_post, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint47d_pre, checkpoint51t_post, checkpoint58t_post, checkpoint38, checkpoint51n_post, release1_chkpt44d_post, checkpoint55i_post, checkpoint58m_post, checkpoint57l_post, checkpoint52i_pre, hrcube_1, hrcube_2, hrcube_3, checkpoint51s_post, checkpoint47a_post, checkpoint57t_post, checkpoint55c_post, checkpoint48d_pre, checkpoint51j_post, checkpoint47i_post, checkpoint63g, checkpoint52e_pre, checkpoint57v_post, checkpoint57f_post, checkpoint52e_post, checkpoint51n_pre, checkpoint47d_post, icebear5, icebear4, icebear3, icebear2, checkpoint53d_post, checkpoint46d_pre, checkpoint40pre2, checkpoint64, checkpoint65, checkpoint60, checkpoint61, checkpoint62, checkpoint63, checkpoint57a_post, checkpoint48d_post, release1-branch_tutorials, checkpoint57h_pre, checkpoint66g, checkpoint66f, checkpoint66e, checkpoint66d, checkpoint66c, checkpoint66b, checkpoint66a, checkpoint66o, checkpoint66n, checkpoint66m, checkpoint66l, checkpoint66k, checkpoint66j, checkpoint66i, checkpoint66h, checkpoint48f_post, checkpoint45d_post, checkpoint52b_pre, checkpoint54b_post, checkpoint46j_pre, checkpoint58w_post, checkpoint57h_post, checkpoint51l_pre, checkpoint52m_post, checkpoint57y_pre, chkpt44a_post, checkpoint55g_post, checkpoint44h_pre, checkpoint48h_post, checkpoint51q_post, checkpoint40pre4, ecco_c50_e29, checkpoint51b_pre, checkpoint46a_post, checkpoint47g_post, checkpoint52b_post, checkpoint52c_post, checkpoint46j_post, checkpoint51h_pre, checkpoint46k_post, ecco_c50_e28, chkpt44c_pre, checkpoint58o_post, checkpoint48a_post, checkpoint45a_post, checkpoint57c_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, checkpoint58p_post, checkpoint58q_post, checkpoint52f_pre, checkpoint55d_post, ecco_c44_e19, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, checkpoint58e_post, release1_p10, release1_p11, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47j_post, checkpoint54a_pre, checkpoint63p, checkpoint63q, checkpoint63r, checkpoint63s, checkpoint63l, checkpoint63m, checkpoint63n, checkpoint63o, checkpoint63h, checkpoint63i, checkpoint63j, checkpoint63k, checkpoint63d, checkpoint63e, checkpoint63f, ecco_c50_e33a, checkpoint53c_post, checkpoint63a, checkpoint63b, checkpoint63c, checkpoint55d_pre, checkpoint57c_pre, checkpoint58r_post, checkpoint55j_post, branch-exfmods-tag, checkpoint44g_post, branchpoint-genmake2, checkpoint54a_post, checkpoint46e_pre, checkpoint55h_post, checkpoint58n_post, checkpoint51r_post, checkpoint48c_post, checkpoint45b_post, checkpoint46b_pre, checkpoint51i_post, checkpoint57e_post, release1-branch-end, release1_final_v1, checkpoint55b_post, checkpoint51b_post, checkpoint51c_post, checkpoint46c_pre, checkpoint53a_post, checkpoint46, checkpoint65o, checkpoint47b_post, checkpoint44b_post, checkpoint59q, checkpoint59p, checkpoint59r, checkpoint59e, checkpoint59d, checkpoint59g, checkpoint59f, checkpoint59a, checkpoint55f_post, checkpoint59c, checkpoint59b, checkpoint59m, checkpoint59l, checkpoint59o, checkpoint59n, checkpoint59i, checkpoint59h, checkpoint59k, ecco_c51_e34, checkpoint46h_pre, checkpoint52d_post, checkpoint53g_post, checkpoint46m_post, checkpoint57p_post, checkpint57u_post, checkpoint46a_pre, checkpoint50g_post, checkpoint45c_post, checkpoint57q_post, ecco_ice2, ecco_ice1, checkpoint44h_post, eckpoint57e_pre, checkpoint46g_post, release1_p12_pre, checkpoint58k_post, checkpoint39, checkpoint52a_pre, checkpoint62b, ecco_c44_e22, checkpoint58v_post, checkpoint50h_post, checkpoint52i_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint51i_pre, checkpoint52h_pre, checkpoint56a_post, checkpoint64y, checkpoint64x, checkpoint58l_post, checkpoint64z, checkpoint53f_post, checkpoint64q, checkpoint64p, checkpoint64s, checkpoint64r, checkpoint64u, checkpoint64t, checkpoint64w, checkpoint64v, checkpoint64i, checkpoint64h, checkpoint64k, checkpoint64j, checkpoint64m, checkpoint64l, checkpoint64o, checkpoint64n, checkpoint64a, checkpoint64c, checkpoint64b, checkpoint64e, checkpoint64d, checkpoint64g, checkpoint64f, checkpoint40pre5, checkpoint57h_done, checkpoint52j_post, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, checkpoint46i_post, ecco_c44_e23, ecco_c44_e20, ecco_c44_e21, ecco_c44_e26, ecco_c44_e27, ecco_c44_e24, checkpoint57j_post, checkpoint57f_pre, checkpoint61f, checkpoint46c_post, checkpoint58g_post, ecco-branch-mod1, ecco-branch-mod2, ecco-branch-mod3, ecco-branch-mod4, ecco-branch-mod5, branch-netcdf, checkpoint50d_pre, checkpoint58x_post, checkpoint61n, checkpoint52n_post, checkpoint53b_pre, checkpoint46e_post, checkpoint59j, release1_beta1, checkpoint58h_post, checkpoint56c_post, checkpoint58j_post, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint57a_pre, checkpoint40, checkpoint41, checkpoint55a_post, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint57o_post, checkpoint46h_post, checkpoint51o_post, checkpoint61q, checkpoint57k_post, checkpoint51f_pre, chkpt44c_post, checkpoint48g_post, checkpoint53b_post, checkpoint47h_post, checkpoint52a_post, checkpoint57w_post, checkpoint61e, checkpoint44f_pre, checkpoint58i_post, checkpoint51g_post, ecco_c52_e35, checkpoint57x_post, checkpoint46d_post, checkpoint50b_post, checkpoint58c_post, checkpoint58u_post, release1-branch_branchpoint, checkpoint51m_post, checkpoint53d_pre, checkpoint58s_post, checkpoint55e_post, checkpoint61g, checkpoint61d, checkpoint54c_post, checkpoint61b, checkpoint61c, checkpoint61a, checkpoint51a_post, checkpoint61o, checkpoint61l, checkpoint61m, checkpoint61j, checkpoint61k, checkpoint61h, checkpoint61i, checkpoint61v, checkpoint61w, checkpoint61t, checkpoint61u, checkpoint61r, checkpoint61s, checkpoint61p, checkpoint51p_post, checkpoint61z, checkpoint61x, checkpoint61y, checkpoint51u_post, HEAD
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_final, release1-branch, branch-genmake2, release1, branch-nonh, tg2-branch, ecco-branch, release1_50yr, netcdf-sm0, icebear, checkpoint51n_branch, release1_coupled
Changes since 1.3: +12 -12 lines 
See doc/tag-index and doc/notes_c37_adj.txt
Preparation for stand-alone autodifferentiability.
1 C $Header: /u/gcmpack/models/MITgcmUV/pkg/zonal_filt/zonal_filt_presmooth.F,v 1.3 2001/02/04 14:38:51 cnh Exp $
2 C $Name: checkpoint37 $
3
4 #include "ZONAL_FILT_OPTIONS.h"
5
6 SUBROUTINE ZONAL_FILT_PRESMOOTH(
7 I holeMask,
8 U field,
9 O avgField,
10 I lField,
11 I myThid )
12 C /==========================================================\
13 C | S/R ZONAL_FILT_PRESMOOTH |
14 C | o Smooth data with holes ready for FFT. |
15 C |==========================================================|
16 C | FFT routines act on a series of data points. Having |
17 C | arbitrary values in land introduces unrealistic noise in |
18 C | the series. A better approach is to linearly ramp data |
19 C | through the missing points. The mean of the field is also|
20 C | removed. The mean is restored in FFT_POSTSMOOTH. This |
21 C | step ensures no bias is introduced by the FFT process - |
22 C | strictly it isnt necessary, but it can help improve |
23 C | numerical conditioning. |
24 C \==========================================================/
25 IMPLICIT NONE
26
27 C == Global data ==
28 #include "SIZE.h"
29 #include "EEPARAMS.h"
30 #include "PARAMS.h"
31 #include "GRID.h"
32
33 C == Routine arguments ==
34 C holeMask - Array with 0 for holes and != 0 for valid data.
35 C lField - Length of field to smooth (assumed periodic)
36 C field - Field smoothed.
37 C myThid - Thread number of this instance of FFT_PRESMOOTH_IN_X
38 INTEGER lField
39 Real*8 holeMask(lField)
40 Real*8 field(lField)
41 Real*8 avgField
42 INTEGER myThid
43
44 #ifdef ALLOW_ZONAL_FILT
45
46 C == Local variables ====
47 C I - Loop counter
48 C lbuf - Size of buffer arrays
49 C hBase - Coord for last valid data point.
50 C hHead - Coord for next valid data point.
51 C hLo - Index for last valid data point.
52 C hHi - Index for next valid data point.
53 C nValid - Count of valid data points.
54 C dist, len - Temps for interpolating.
55 C frac Interpolation is simple linear ramp
56 C between end-point in grid-point space.
57 C e.g. for a series of points
58 C Index 1 2 3 4 5 6 7 8 9 10 11 12
59 C Data M V M M M M V V V V V V
60 C where M indicates missing data and V valid
61 C and 1 2 3 .... are indexes in field. Values
62 C for the M points are found by interpolating
63 C between the two V values that bracket a series
64 C of M point. For index=1
65 C dist=1, len=2 and frac=dist/len=1/2 so that
66 C the interpolated value at index=1 is
67 C V(index=12)+frac*( V(index=2)-V(index=12) ).
68 C For index=5 dist=3, len=5 and frac=dist/len=3/5
69 C so interpolated value at index=5 is
70 C V(index=2)+frac*( V(index=7)-V(index=2) ).
71 C lastGood - Temp for tracking of last good data point index.
72 C nValid - Temp for counting number of valid points.
73 C
74 INTEGER lBuf
75 PARAMETER ( lBuf = sNx )
76 INTEGER hBase(lBuf)
77 INTEGER hHead(lBuf)
78 INTEGER hLo(lBuf)
79 INTEGER hHi(lBuf)
80 INTEGER lastGood
81 _RL dist
82 _RL len
83 _RL frac
84 INTEGER nValid
85 INTEGER I, iLo, iHi
86
87
88 C
89 IF ( lField .GT. lBuf ) THEN
90 STOP 'S/R FFT_PRESMOOTH_1D: lField .GT. lBuf'
91 ENDIF
92
93 CcnhDebugStarts
94 C WRITE(*,*) 'Before FFT pre-smooth'
95 C WRITE(*,'(A,A)') 'Mask ', 'Data'
96 C DO I=1,lField
97 C WRITE(*,'(A,I4,1X,F3.1,1X,1PE35.25)') 'I= ',I,holeMask(I), field(I)
98 C ENDDO
99 CcnhDebugEnds
100
101 C Count number of valid data points
102 nValid = 0
103 avgField = 0.
104 DO I=1,lField
105 IF ( holeMask(I) .NE. 0. ) THEN
106 nValid = nValid+1
107 avgField = avgField+field(I)
108 ENDIF
109 ENDDO
110
111 IF ( lField .GT. 1 .AND. nValid .GT. 0 ) THEN
112 C Get lists of hole starts, ends and extents
113 C ( use periodic wrap around ).
114
115 C 1. hLo - Index of valid point at start of run of holes
116 C hBase - Coord of hLo (used to get offset when interpolating).
117 C Note: The mean is also subtracted from field here.
118 lastGood = -1
119 avgField = avgField/FLOAT(nValid)
120 DO I=1,lField
121 IF ( holeMask(I) .EQ. 0. ) THEN
122 C A hole
123 hLo (I) = lastGood
124 hBase(I) = lastGood
125 ELSE
126 C Data
127 hLo(I) = 0
128 hBase(I) = 0
129 lastGood = I
130 field(I) = field(I)-avgField
131 ENDIF
132 ENDDO
133 DO I=1,lField
134 IF ( hLo(I) .EQ. -1 ) THEN
135 hLo(I) = lastGood
136 hBase(I) = lastGood-lField
137 ENDIF
138 ENDDO
139
140 C 2. hHi - Coord of valid point at end of run of holes.
141 lastGood = -1
142 DO I=lField,1,-1
143 IF ( holeMask(I) .EQ. 0. ) THEN
144 C A hole
145 hHi(I) = lastGood
146 hHead(I) = lastGood
147 ELSE
148 C Data
149 hHi(I) = 0
150 lastGood = I
151 ENDIF
152 ENDDO
153 DO I=lField,1,-1
154 IF ( hHi(I) .EQ. -1 ) THEN
155 hHi(I) = lastGood
156 hHead(I) = lastGood+lField
157 ENDIF
158 ENDDO
159
160 CcnhDebugStarts
161 C WRITE(*,*) 'During FFT pre-smooth'
162 C WRITE(*,'(A,A,A,A,A,A)') 'I ','mask(I)','hHi(I)','hLo(I)','hBase(I)','hHead(I)'
163 C DO I=1,lField
164 C WRITE(*,'(6(I4,1X))')
165 C & I,INT(holeMask(I)),hHi(I),hLo(I),hBase(I),hHead(I)
166 C ENDDO
167 CcnhDebugEnds
168
169 C 3. Interpolate
170 DO I=1,lField
171 IF ( holeMask(I) .EQ. 0. ) THEN
172 C A hole
173 iLo = hLo(I)
174 iHi = hHi(I)
175 dist = I-hBase(I)
176 len = hHead(I) - hBase(I)
177 CcnhDebugStarts
178 C WRITE(*,'(A,1X,I4,1X,1PE35.25,1X,1PE35.25,)') 'I= ',I,dist, len
179 C IF ( dist .LT. 0 ) STOP ' DIST .LT. 0 '
180 C IF ( len .LT. 0 ) STOP ' LEN .LT. 0 '
181 C IF ( dist .GT. lField ) STOP ' dist .GT. lField '
182 C IF ( len .GT. lField ) STOP ' len .GT. lField '
183 C IF ( dist .GT. len ) STOP ' dist .GT. len '
184 CcnhDebugStarts
185 frac = dist/len
186 field(I) = field(iLo)
187 & +(field(iHi)-field(iLo))*frac
188 ENDIF
189 ENDDO
190
191 CcnhDebugStarts
192 C WRITE(*,*) 'After FFT pre-smooth'
193 C WRITE(*,'(A,A)') 'Mask ', 'Data'
194 C DO I=1,lField
195 C WRITE(*,'(A,I4,1X,F3.1,1X,1PE35.25)') 'I= ',I,holeMask(I), field(I)
196 C ENDDO
197 CcnhDebugEnds
198
199 ENDIF
200 C
201 #endif /* ALLOW_ZONAL_FILT */
202
203 RETURN
204 END
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