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! $Id: extrapol.F 1952 2014-01-28 13:05:47Z lguez $ |
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SUBROUTINE extrapol (pfild, kxlon, kylat, pmask, |
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. norsud, ldper, knbor, pwork) |
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IMPLICIT none |
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c |
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c OASIS routine (Adaptation: Laurent Li, le 14 mars 1997) |
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c Fill up missed values by using the neighbor points |
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INTEGER kxlon, kylat ! longitude and latitude dimensions (Input) |
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INTEGER knbor ! minimum neighbor number (Input) |
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LOGICAL norsud ! True if field is from North to South (Input) |
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LOGICAL ldper ! True if take into account the periodicity (Input) |
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REAL pmask ! mask value (Input) |
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REAL pfild(kxlon,kylat) ! field to be extrapolated (Input/Output) |
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REAL pwork(kxlon,kylat) ! working space |
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c |
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REAL zwmsk |
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INTEGER incre, idoit, i, j, k, inbor, ideb, ifin, ilon, jlat |
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INTEGER ix(9), jy(9) ! index arrays for the neighbors coordinates |
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REAL zmask(9) |
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C |
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C We search over the eight closest neighbors |
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C |
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C j+1 7 8 9 |
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C j 4 5 6 Current point 5 --> (i,j) |
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C j-1 1 2 3 |
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C i-1 i i+1 |
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c |
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IF (norsud) THEN |
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DO j = 1, kylat |
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DO i = 1, kxlon |
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pwork(i,j) = pfild(i,kylat-j+1) |
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ENDDO |
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ENDDO |
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DO j = 1, kylat |
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DO i = 1, kxlon |
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pfild(i,j) = pwork(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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c |
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incre = 0 |
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c |
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DO j = 1, kylat |
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DO i = 1, kxlon |
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pwork(i,j) = pfild(i,j) |
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ENDDO |
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ENDDO |
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c |
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C* To avoid problems in floating point tests |
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zwmsk = pmask - 1.0 |
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c |
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200 CONTINUE |
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incre = incre + 1 |
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DO 99999 j = 1, kylat |
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DO 99999 i = 1, kxlon |
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IF (pfild(i,j).GT. zwmsk) THEN |
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pwork(i,j) = pfild(i,j) |
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inbor = 0 |
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ideb = 1 |
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ifin = 9 |
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C |
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C* Fill up ix array |
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ix(1) = MAX (1,i-1) |
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ix(2) = i |
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ix(3) = MIN (kxlon,i+1) |
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ix(4) = MAX (1,i-1) |
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ix(5) = i |
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ix(6) = MIN (kxlon,i+1) |
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ix(7) = MAX (1,i-1) |
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ix(8) = i |
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ix(9) = MIN (kxlon,i+1) |
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C |
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C* Fill up iy array |
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jy(1) = MAX (1,j-1) |
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jy(2) = MAX (1,j-1) |
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jy(3) = MAX (1,j-1) |
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jy(4) = j |
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jy(5) = j |
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jy(6) = j |
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jy(7) = MIN (kylat,j+1) |
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jy(8) = MIN (kylat,j+1) |
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jy(9) = MIN (kylat,j+1) |
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C |
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C* Correct latitude bounds if southernmost or northernmost points |
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IF (j .EQ. 1) ideb = 4 |
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IF (j .EQ. kylat) ifin = 6 |
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C |
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C* Account for periodicity in longitude |
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C |
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IF (ldper) THEN |
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IF (i .EQ. kxlon) THEN |
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ix(3) = 1 |
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ix(6) = 1 |
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ix(9) = 1 |
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ELSE IF (i .EQ. 1) THEN |
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ix(1) = kxlon |
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ix(4) = kxlon |
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ix(7) = kxlon |
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ENDIF |
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ELSE |
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IF (i .EQ. 1) THEN |
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ix(1) = i |
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ix(2) = i + 1 |
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ix(3) = i |
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ix(4) = i + 1 |
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ix(5) = i |
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ix(6) = i + 1 |
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ENDIF |
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IF (i .EQ. kxlon) THEN |
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ix(1) = i -1 |
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ix(2) = i |
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ix(3) = i - 1 |
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ix(4) = i |
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ix(5) = i - 1 |
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ix(6) = i |
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ENDIF |
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C |
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IF (i .EQ. 1 .OR. i .EQ. kxlon) THEN |
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jy(1) = MAX (1,j-1) |
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jy(2) = MAX (1,j-1) |
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jy(3) = j |
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jy(4) = j |
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jy(5) = MIN (kylat,j+1) |
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jy(6) = MIN (kylat,j+1) |
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C |
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ideb = 1 |
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ifin = 6 |
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IF (j .EQ. 1) ideb = 3 |
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IF (j .EQ. kylat) ifin = 4 |
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ENDIF |
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ENDIF ! end for ldper test |
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C |
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C* Find unmasked neighbors |
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C |
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DO 230 k = ideb, ifin |
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zmask(k) = 0. |
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ilon = ix(k) |
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jlat = jy(k) |
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IF (pfild(ilon,jlat) .LT. zwmsk) THEN |
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zmask(k) = 1. |
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inbor = inbor + 1 |
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ENDIF |
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230 CONTINUE |
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C |
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C* Not enough points around point P are unmasked; interpolation on P |
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C will be done in a future call to extrap. |
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C |
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IF (inbor .GE. knbor) THEN |
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pwork(i,j) = 0. |
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DO k = ideb, ifin |
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ilon = ix(k) |
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jlat = jy(k) |
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pwork(i,j) = pwork(i,j) |
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$ + pfild(ilon,jlat) * zmask(k)/ REAL(inbor) |
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ENDDO |
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ENDIF |
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C |
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ENDIF |
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99999 CONTINUE |
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C |
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C* 3. Writing back unmasked field in pfild |
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C ------------------------------------ |
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C |
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C* pfild then contains: |
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C - Values which were not masked |
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C - Interpolated values from the inbor neighbors |
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C - Values which are not yet interpolated |
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C |
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idoit = 0 |
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DO j = 1, kylat |
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DO i = 1, kxlon |
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IF (pwork(i,j) .GT. zwmsk) idoit = idoit + 1 |
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pfild(i,j) = pwork(i,j) |
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ENDDO |
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ENDDO |
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c |
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IF (idoit .ne. 0) GOTO 200 |
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ccc PRINT*, "Number of extrapolation steps incre =", incre |
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c |
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IF (norsud) THEN |
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DO j = 1, kylat |
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DO i = 1, kxlon |
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pwork(i,j) = pfild(i,kylat-j+1) |
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ENDDO |
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ENDDO |
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DO j = 1, kylat |
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DO i = 1, kxlon |
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pfild(i,j) = pwork(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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c |
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RETURN |
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END |