| 1 |
|
C $Header$ |
| 2 |
|
|
| 3 |
|
#include "ZONAL_FILT_OPTIONS.h" |
| 4 |
|
|
| 5 |
|
SUBROUTINE ZONAL_FILT_PRESMOOTH( |
| 6 |
|
I holeMask, |
| 7 |
|
U field, |
| 8 |
|
O avgField, |
| 9 |
|
I lField, |
| 10 |
|
I myThid ) |
| 11 |
|
C /==========================================================\ |
| 12 |
|
C | S/R ZONAL_FILT_PRESMOOTH | |
| 13 |
|
C | o Smooth data with holes ready for FFT. | |
| 14 |
|
C |==========================================================| |
| 15 |
|
C | FFT routines act on a series of data points. Having | |
| 16 |
|
C | arbitrary values in land introduces unrealistic noise in | |
| 17 |
|
C | the series. A better approach is to linearly ramp data | |
| 18 |
|
C | through the missing points. The mean of the field is also| |
| 19 |
|
C | removed. The mean is restored in FFT_POSTSMOOTH. This | |
| 20 |
|
C | step ensures no bias is introduced by the FFT process - | |
| 21 |
|
C | strictly it isnt necessary, but it can help improve | |
| 22 |
|
C | numerical conditioning. | |
| 23 |
|
C \==========================================================/ |
| 24 |
|
IMPLICIT NONE |
| 25 |
|
|
| 26 |
|
C == Global data == |
| 27 |
|
#include "SIZE.h" |
| 28 |
|
#include "EEPARAMS.h" |
| 29 |
|
#include "PARAMS.h" |
| 30 |
|
#include "GRID.h" |
| 31 |
|
|
| 32 |
|
C == Routine arguments == |
| 33 |
|
C holeMask - Array with 0 for holes and != 0 for valid data. |
| 34 |
|
C lField - Length of field to smooth (assumed periodic) |
| 35 |
|
C field - Field smoothed. |
| 36 |
|
C myThid - Thread number of this instance of FFT_PRESMOOTH_IN_X |
| 37 |
|
INTEGER lField |
| 38 |
|
Real*8 holeMask(lField) |
| 39 |
|
Real*8 field(lField) |
| 40 |
|
Real*8 avgField |
| 41 |
|
INTEGER myThid |
| 42 |
|
|
| 43 |
|
#ifdef ALLOW_ZONAL_FILT |
| 44 |
|
|
| 45 |
|
C == Local variables ==== |
| 46 |
|
C I - Loop counter |
| 47 |
|
C lbuf - Size of buffer arrays |
| 48 |
|
C hBase - Coord for last valid data point. |
| 49 |
|
C hHead - Coord for next valid data point. |
| 50 |
|
C hLo - Index for last valid data point. |
| 51 |
|
C hHi - Index for next valid data point. |
| 52 |
|
C nValid - Count of valid data points. |
| 53 |
|
C dist, len - Temps for interpolating. |
| 54 |
|
C frac Interpolation is simple linear ramp |
| 55 |
|
C between end-point in grid-point space. |
| 56 |
|
C e.g. for a series of points |
| 57 |
|
C Index 1 2 3 4 5 6 7 8 9 10 11 12 |
| 58 |
|
C Data M V M M M M V V V V V V |
| 59 |
|
C where M indicates missing data and V valid |
| 60 |
|
C and 1 2 3 .... are indexes in field. Values |
| 61 |
|
C for the M points are found by interpolating |
| 62 |
|
C between the two V values that bracket a series |
| 63 |
|
C of M point. For index=1 |
| 64 |
|
C dist=1, len=2 and frac=dist/len=1/2 so that |
| 65 |
|
C the interpolated value at index=1 is |
| 66 |
|
C V(index=12)+frac*( V(index=2)-V(index=12) ). |
| 67 |
|
C For index=5 dist=3, len=5 and frac=dist/len=3/5 |
| 68 |
|
C so interpolated value at index=5 is |
| 69 |
|
C V(index=2)+frac*( V(index=7)-V(index=2) ). |
| 70 |
|
C lastGood - Temp for tracking of last good data point index. |
| 71 |
|
C nValid - Temp for counting number of valid points. |
| 72 |
|
C |
| 73 |
|
INTEGER lBuf |
| 74 |
|
PARAMETER ( lBuf = sNx ) |
| 75 |
|
INTEGER hBase(lBuf) |
| 76 |
|
INTEGER hHead(lBuf) |
| 77 |
|
INTEGER hLo(lBuf) |
| 78 |
|
INTEGER hHi(lBuf) |
| 79 |
|
INTEGER lastGood |
| 80 |
|
_RL dist |
| 81 |
|
_RL len |
| 82 |
|
_RL frac |
| 83 |
|
INTEGER nValid |
| 84 |
|
INTEGER I, iLo, iHi |
| 85 |
|
|
| 86 |
|
|
| 87 |
|
C |
| 88 |
|
IF ( lField .GT. lBuf ) THEN |
| 89 |
|
STOP 'S/R FFT_PRESMOOTH_1D: lField .GT. lBuf' |
| 90 |
|
ENDIF |
| 91 |
|
|
| 92 |
|
CcnhDebugStarts |
| 93 |
|
C WRITE(0,*) 'Before FFT pre-smooth' |
| 94 |
|
C WRITE(0,'(A,A)') 'Mask ', 'Data' |
| 95 |
|
C DO I=1,lField |
| 96 |
|
C WRITE(0,'(A,I4,1X,F3.1,1X,1PE35.25)') 'I= ',I,holeMask(I), field(I) |
| 97 |
|
C ENDDO |
| 98 |
|
CcnhDebugEnds |
| 99 |
|
|
| 100 |
|
C Count number of valid data points |
| 101 |
|
nValid = 0 |
| 102 |
|
avgField = 0. |
| 103 |
|
DO I=1,lField |
| 104 |
|
IF ( holeMask(I) .NE. 0. ) THEN |
| 105 |
|
nValid = nValid+1 |
| 106 |
|
avgField = avgField+field(I) |
| 107 |
|
ENDIF |
| 108 |
|
ENDDO |
| 109 |
|
|
| 110 |
|
IF ( lField .GT. 1 .AND. nValid .GT. 0 ) THEN |
| 111 |
|
C Get lists of hole starts, ends and extents |
| 112 |
|
C ( use periodic wrap around ). |
| 113 |
|
|
| 114 |
|
C 1. hLo - Index of valid point at start of run of holes |
| 115 |
|
C hBase - Coord of hLo (used to get offset when interpolating). |
| 116 |
|
C Note: The mean is also subtracted from field here. |
| 117 |
|
lastGood = -1 |
| 118 |
|
avgField = avgField/FLOAT(nValid) |
| 119 |
|
DO I=1,lField |
| 120 |
|
IF ( holeMask(I) .EQ. 0. ) THEN |
| 121 |
|
C A hole |
| 122 |
|
hLo (I) = lastGood |
| 123 |
|
hBase(I) = lastGood |
| 124 |
|
ELSE |
| 125 |
|
C Data |
| 126 |
|
hLo(I) = 0 |
| 127 |
|
hBase(I) = 0 |
| 128 |
|
lastGood = I |
| 129 |
|
field(I) = field(I)-avgField |
| 130 |
|
ENDIF |
| 131 |
|
ENDDO |
| 132 |
|
DO I=1,lField |
| 133 |
|
IF ( hLo(I) .EQ. -1 ) THEN |
| 134 |
|
hLo(I) = lastGood |
| 135 |
|
hBase(I) = lastGood-lField |
| 136 |
|
ENDIF |
| 137 |
|
ENDDO |
| 138 |
|
|
| 139 |
|
C 2. hHi - Coord of valid point at end of run of holes. |
| 140 |
|
lastGood = -1 |
| 141 |
|
DO I=lField,1,-1 |
| 142 |
|
IF ( holeMask(I) .EQ. 0. ) THEN |
| 143 |
|
C A hole |
| 144 |
|
hHi(I) = lastGood |
| 145 |
|
hHead(I) = lastGood |
| 146 |
|
ELSE |
| 147 |
|
C Data |
| 148 |
|
hHi(I) = 0 |
| 149 |
|
lastGood = I |
| 150 |
|
ENDIF |
| 151 |
|
ENDDO |
| 152 |
|
DO I=lField,1,-1 |
| 153 |
|
IF ( hHi(I) .EQ. -1 ) THEN |
| 154 |
|
hHi(I) = lastGood |
| 155 |
|
hHead(I) = lastGood+lField |
| 156 |
|
ENDIF |
| 157 |
|
ENDDO |
| 158 |
|
|
| 159 |
|
CcnhDebugStarts |
| 160 |
|
C WRITE(0,*) 'During FFT pre-smooth' |
| 161 |
|
C WRITE(0,'(A,A,A,A,A,A)') 'I ','mask(I)','hHi(I)','hLo(I)','hBase(I)','hHead(I)' |
| 162 |
|
C DO I=1,lField |
| 163 |
|
C WRITE(0,'(6(I4,1X))') |
| 164 |
|
C & I,INT(holeMask(I)),hHi(I),hLo(I),hBase(I),hHead(I) |
| 165 |
|
C ENDDO |
| 166 |
|
CcnhDebugEnds |
| 167 |
|
|
| 168 |
|
C 3. Interpolate |
| 169 |
|
DO I=1,lField |
| 170 |
|
IF ( holeMask(I) .EQ. 0. ) THEN |
| 171 |
|
C A hole |
| 172 |
|
iLo = hLo(I) |
| 173 |
|
iHi = hHi(I) |
| 174 |
|
dist = I-hBase(I) |
| 175 |
|
len = hHead(I) - hBase(I) |
| 176 |
|
CcnhDebugStarts |
| 177 |
|
C WRITE(0,'(A,1X,I4,1X,1PE35.25,1X,1PE35.25,)') 'I= ',I,dist, len |
| 178 |
|
C IF ( dist .LT. 0 ) STOP ' DIST .LT. 0 ' |
| 179 |
|
C IF ( len .LT. 0 ) STOP ' LEN .LT. 0 ' |
| 180 |
|
C IF ( dist .GT. lField ) STOP ' dist .GT. lField ' |
| 181 |
|
C IF ( len .GT. lField ) STOP ' len .GT. lField ' |
| 182 |
|
C IF ( dist .GT. len ) STOP ' dist .GT. len ' |
| 183 |
|
CcnhDebugStarts |
| 184 |
|
frac = dist/len |
| 185 |
|
field(I) = field(iLo) |
| 186 |
|
& +(field(iHi)-field(iLo))*frac |
| 187 |
|
ENDIF |
| 188 |
|
ENDDO |
| 189 |
|
|
| 190 |
|
CcnhDebugStarts |
| 191 |
|
C WRITE(0,*) 'After FFT pre-smooth' |
| 192 |
|
C WRITE(0,'(A,A)') 'Mask ', 'Data' |
| 193 |
|
C DO I=1,lField |
| 194 |
|
C WRITE(0,'(A,I4,1X,F3.1,1X,1PE35.25)') 'I= ',I,holeMask(I), field(I) |
| 195 |
|
C ENDDO |
| 196 |
|
CcnhDebugEnds |
| 197 |
|
|
| 198 |
|
ENDIF |
| 199 |
|
C |
| 200 |
|
#endif /* ALLOW_ZONAL_FILT */ |
| 201 |
|
|
| 202 |
|
RETURN |
| 203 |
|
END |
Parent Directory
| 
Revision Log
| 
Revision Graph
| 
Patch