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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 INTOCNU(HICODE,HSCODE,RTOP,RBOTT,RRIGHT,RLEFT,
* RYRES,RXRES,
* INOCEAN,KLENP,KLENI,TARRAY,
* XARR,YARR,NXP,NYP,PARRAY,IINTPOL,ISTAGP)
C
C---->
C**** INTOCNU - interpolates grib ocean data
C
C
C PURPOSE
C -------
C Interpolates data to new grid, according to instructions.
C Missing data is flagged with -999.9; this information is
C passed to the new field.
C
C
C Interface.
C ----------
C
C IRET = INTOCNU(....)
C
C Input parameters.
C -----------------
C
C HICODE Interpolation code
C 'N' No interpolation
C 'R' Interpolate only to make grid Regular
C 'X' Interpolate in x only
C 'Y' Interpolate in y only
C 'F' Interpolate in x and y (Full)
C HSCODE Staggered grid code
C 'D' Drop every second row ('even' points)
C 'X' Augment to standard grid by x interpolation
C 'Y' Augment to standard grid by y interpolation
C 'F' Augment to standard grid by x-y interpolation
C RTOP Top of output field domain (degrees/metres/days)
C RBOTT Bottom of output field domain ( " )
C RRIGHT Right of output field domain ( " )
C RLEFT Left of output field domain ( " )
C RYRES Resolution for y-interpolation ( " )
C RXRES Resolution for x-interpolation ( " )
C KSEC1 Product definition block (+ high res. grid data)
C INOCEAN Input data array
C KLENP Size of input array
C KLENI Size of scratch array (and also output array PARRAY)
C TARRAY Scratch array for use during interpolation
C
C Output parameters.
C ------------------
C
C Returns 0 if the interpolation is successful, otherwise non-zero.
C
C XARR x cordinates of data values, or XO,XSTEP,
C 0.0 for regular spacing
C YARR y cordinates of data values, or YO,YSTEP,
C 0.0 for regular spacing
C NXP x dimension of output field
C NYP y dimension of output field
C PARRAY output field array
C IINTPOL Flag for interpolation done
C = 0 if none,
C = 1 if x only,
C = 2 if y only,
C = 3 if x and y.
C ISTAGP Flag to show processing done for staggered grid:
C = 0 if none
C = 2 if every second row dropped.
C = 3 if interpolated in x only.
C = 4 if interpolated in y only.
C = 5 if interpolated in x and y.
C
C
C Method.
C -------
C Convention is always to have output field array starting in bottom
C left hand corner of the field. The positional information for the
C data and for the axes is also given starting in the bottom left
C hand corner. This means YARR and INOCEAN must be inverted for the
C default grib scanning, which starts in the top left hand corner.
C
C
C Externals.
C ----------
C
C INTLOG - Logs warning messages.
C INTLOGR - Logs warning messages.
C
C
C Reference.
C ----------
C
C None.
C
C
C Author.
C -------
C
C T. Stockdale ECMWF 23.02.93
C
C
C Modifications.
C --------------
C
C T. Stockdale ECMWF 20.05.93
C Revised for local grib.
C
C J.D.Chambers ECMWF 04.10.95
C Make into a function (remove STOPs).
C
C T. Stockdale ECMWF 26.09.02
C Drop odd points (not even) from E grid, for better land sea mask
C
C T. Stockdale ECMWF 07.10.02
C New standard code (matches latest rd version)
C
C----<
C ------------------------------------------------------------------
C* Section 0 . Definition of variables. Data statements.
C ------------------------------------------------------------------
C
IMPLICIT NONE
C
C Parameters
INTEGER JPROUTINE, JP_LONG
PARAMETER (JPROUTINE = 33300 )
PARAMETER (JP_LONG = 3 )
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
C
C Subroutine arguments.
CHARACTER*1 HICODE,HSCODE
REAL RTOP, RBOTT, RRIGHT, RLEFT, RYRES, RXRES
INTEGER KLENP, KLENI, NXP, NYP, IINTPOL, ISTAGP
REAL INOCEAN, TARRAY, XARR, YARR, PARRAY
DIMENSION INOCEAN(*)
DIMENSION XARR(*), YARR(*)
DIMENSION TARRAY(KLENI), PARRAY(KLENI)
C
C Local variables
INTEGER NX, NY, KLAT1, KLAT2, KLON1, KXINC, KYINC, ISTAG
INTEGER IIRREG, JGCL, J, I, JSKIP, NXLEFT, NXRIGH, IWRAP, JI
INTEGER JIP, JJ, IOFFSET, NEWPTS, JN, IPOS, IPOSM, JPOS
INTEGER IPOSP1M, JMIN, JMAX, JLEFT, JJP, JJEFF
INTEGER NYLEFTI, NYLEFT, NYRIGH
REAL XUNIT, YUNIT, RRVAL, RLVAL, RUVAL, RDVAL, RXIRES
REAL XSIGN, XRSIGN, XFPREV, XFPOSN, RPOS, RVALL, RVALR
REAL XVAL, XOWEST, XORES, XPSIGN, RVAL, RYIRES, YFPREV, YFPOSN
REAL YSIGN, YPSIGN, YRSIGN, RMISS, EPS
REAL RVALB, RVALT, XOSOUT
LOGICAL LNEAREST
C
C YSIGN Flag for direction of y co-ords in data:
C +1 if co-ords are increasing with index of INOCEAN
C -1 if decreasing.
C YPSIGN Flag for direction of y co-ords in output field:
C +1 if co-ords are increasing up the page,
C -1 if decreasing.
C YRSIGN Flag for direction of y co-ords in output field relative
C to that in data: YSIGN*YPSIGN
C IINTPOL Flag for interpolation:
C 0 = none,
C 1 = x only,
C 2 = y only,
C 3 = x and y
C RMISS Value for missing data
C EPS Tolerance on missing data flag
C
C
EXTERNAL INTUP, INTDN, LENA, HDEGS, HMETRES
INTEGER INTUP, INTDN, LENA
CHARACTER*6 HDEGS, HMETRES
C
C Inline function - tests TRUE if A is a missing value
REAL A
LOGICAL MISSING
MISSING(A) = ( ABS(RMISS-A) .LT. EPS )
C
C ------------------------------------------------------------------
C* Section 1 . Set initial values.
C ------------------------------------------------------------------
C
100 CONTINUE
C
INTOCNU = 0
C
C Set key variables from GRIB header blocks.
C
NX = NIWE
NY = NINS
C
cs Coordinate 4 of first grid point
KLAT1 = NIOCO4F
cs Coordinate 4 of last grid point
KLAT2 = NIOCO4L
cs Coordinate 3 of first grid point
KLON1 = NIOCO3F
cs i-increment
KXINC = NIOIINC
cs j-increment
KYINC = NIOJINC
C
cs Flag for normal or staggered grid
ISTAG = NIONOST
cs Flag for irregular grid coordinate list
IIRREG = NIOIRGR
cs 71 Number of entries in the horizontal coordinate definition
cs 72 Number of entries in mixed coordinate definition
cs JGCL = 74+KSEC1(71)+KSEC1(72)
JGCL = 0
C
cs Coordinate 3 flag (x-axis, usually longitude).
IF(NIOCO3.EQ.1) THEN
XUNIT = 1.0/3600.0
ELSE
XUNIT = 1.0E-6
ENDIF
C
cs Coordinate 4 flag (y-axis, usually latitude).
IF(NIOCO4.EQ.2) THEN
YUNIT = 1.0E-3
ELSE IF(NIOCO4.EQ.1) THEN
YUNIT = 1.0/3600.0
ELSE
YUNIT = 1.0E-6
ENDIF
C
IINTPOL = 0
cs RMISS = 9999.0
cs set it from grib_api
RMISS = RMISSGV
EPS = 0.1
cs EPS = 0.01
C
C ------------------------------------------------------------------
C* Section 2 . Deal with staggered grid if present.
C ------------------------------------------------------------------
C
200 CONTINUE
C
C The approach in this section is to replace the staggered grid by
C a non-staggered version, either by interpolating the data onto new
C grid points or by simply dropping half of the data points. A new
C version of INOCEAN is created, and parts of KSEC1 are modified.
C This enables the rest of INTOCNU to treat the field in a consistent
C manner, BUT it means that KSEC1 and INOCEAN will be altered on
C leaving this subroutine (and presently in an inconsistent way).
C
C The interpolations coded in this section ignore the metric of the
C staggered grid, that is they simply average neighbouring values to
C find a new grid point value. The more general case can be added
C later if desired.
C
C Note: we prefer to drop odd points and keep even points, because
C the standard version of HOPE2 uses an external mask to define the
C land-sea mask of its even points. The mask for odd points then has
C to be interpolated, which is less accurate, so the plots look
C better if the even points are kept.
C
C
IF(ISTAG.EQ.1) THEN
C
C Drop odd row points ...
C
IF(HSCODE.EQ.'D') THEN
ISTAGP = 2
NY = NY/2
KYINC = KYINC*2
DO 210 J = 1,NY
DO 210 I = 1,NX
INOCEAN(I+NX*(J-1)) = INOCEAN(I+NX*((J-1)*2+1))
210 CONTINUE
C
C Reset the grid coordinate list.
C Remove the y coordinates of the even rows,
C the x coordinates of the even rows, and also the first x
C coordinate of an even regular row.
C
cs Grid coordinate list
IF(IIRREG.EQ.2) THEN
KLON1 = OCCOOR(1)
DO 212 J = 1,NY
OCCOOR(J) = OCCOOR(1+2*J)
212 CONTINUE
C
ELSE IF(IIRREG.EQ.3) THEN
KLON1 = OCCOOR(1)
JSKIP = NX
DO 214 J = 1,NY
OCCOOR(JSKIP+J) = OCCOOR(JSKIP+NX+2*J)
214 CONTINUE
ENDIF
C
C* Staggered grid: interpolation in x.
C
ELSE IF(HSCODE.EQ.'X') THEN
ISTAGP = 3
NX = NX*2
KXINC = KXINC/2
IF(((NX*NY).GT.KLENI).OR.((NX*NY).GT.KLENP)) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NY)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENP)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 17
GOTO 900
ENDIF
C
C Expand the data into a temporary array, and then copy back
C into INOCEAN. Note the treatment of the end points, which
C assumes a longitude wrap-round. Remember to mask land points
C so that either both points are missing or neither.
C
DO 220 J = 1,NY,2
RRVAL = INOCEAN(1+(J-1)*NX/2)
RLVAL = INOCEAN(NX/2+(J-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(1+(J-1)*NX) = (RRVAL+RLVAL)*0.5
TARRAY(2+(J-1)*NX) = INOCEAN(1+(J-1)*NX/2)
DO 220 I = 2,NX/2
RRVAL = INOCEAN(I +(J-1)*NX/2)
RLVAL = INOCEAN(I-1+(J-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(I*2-1+(J-1)*NX) = (RRVAL+RLVAL)*0.5
TARRAY(I*2 +(J-1)*NX) = INOCEAN(I +(J-1)*NX/2)
220 CONTINUE
C
DO 222 J = 2,NY,2
RRVAL = INOCEAN(1+(J-1)*NX/2)
RLVAL = INOCEAN(NX/2+(J-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(NX+(J-1)*NX) = (RLVAL+RRVAL)*0.5
TARRAY(NX-1+(J-1)*NX) = INOCEAN(NX/2+(J-1)*NX/2)
DO 222 I = 1,NX/2-1
RRVAL = INOCEAN(I+1+(J-1)*NX/2)
RLVAL = INOCEAN(I +(J-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(I*2 +(J-1)*NX) = (RLVAL+RRVAL)*0.5
TARRAY(I*2-1+(J-1)*NX) = INOCEAN(I +(J-1)*NX/2)
222 CONTINUE
DO 224 J = 1,NY
DO 224 I = 1,NX
INOCEAN(I+(J-1)*NX) = TARRAY(I+(J-1)*NX)
224 CONTINUE
C
C Reset the grid coordinate list if necessary, again making
C use of a temporary array. Expand the x-coordinate list,
C and remove the x coordinate of the first even point if grid
C is regular in x.
C
KLON1 = OCCOOR(1)
IF((IIRREG.EQ.1).OR.(IIRREG.EQ.3)) THEN
JSKIP = 0
DO 226 J = 1,NX/2
TARRAY(J*2-1) = OCCOOR(JSKIP+J)
TARRAY(J*2) = OCCOOR(JSKIP+NX/2+J)
226 CONTINUE
DO 227 J = 1,NX
OCCOOR(JSKIP+J) = TARRAY(J)
227 CONTINUE
ELSE IF((IIRREG.EQ.2)) THEN
DO 228 J = 1,NY
OCCOOR(J) = OCCOOR(1+J)
228 CONTINUE
ENDIF
C
C Staggered grid: interpolation in y.
C
ELSE IF(HSCODE.EQ.'Y') THEN
ISTAGP = 4
NX = NX*2
KXINC = KXINC/2
IF(((NX*NY).GT.KLENI).OR.((NX*NY).GT.KLENP)) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NY)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENP)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 18
GOTO 900
ENDIF
C
C Expand the data into a temporary array, and then copy back
C into INOCEAN. For the polarmost rows, use X interpolation.
C
C First the even rows...
DO 230 J = 2,NY-1,2
DO 230 I = 1,NX/2
RUVAL = INOCEAN(I+(J-2)*NX/2)
RDVAL = INOCEAN(I+(J )*NX/2)
IF(MISSING(RUVAL)) RDVAL = RMISS
IF(MISSING(RDVAL)) RUVAL = RMISS
TARRAY(I*2 +(J-1)*NX) = (RDVAL+RUVAL)*0.5
TARRAY(I*2-1+(J-1)*NX) = INOCEAN(I+(J-1)*NX/2)
230 CONTINUE
RRVAL = INOCEAN(1+(NY-1)*NX/2)
RLVAL = INOCEAN(NX/2+(NY-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(NX+(NY-1)*NX) = (RLVAL+RRVAL)*0.5
TARRAY(NX-1+(NY-1)*NX) = INOCEAN(NX/2+(NY-1)*NX/2)
DO 231 I = 2,NX/2
RRVAL = INOCEAN(I+1+(NY-1)*NX/2)
RLVAL = INOCEAN(I+(NY-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(I*2+(NY-1)*NX) = (RRVAL+RLVAL)*0.5
TARRAY(I*2-1+(NY-1)*NX) = INOCEAN(I+(NY-1)*NX/2)
231 CONTINUE
C
C Then the odd rows
DO 232 J = 3,NY-1,2
RUVAL = INOCEAN(NX/2+(J-2)*NX/2)
RDVAL = INOCEAN(NX/2+(J )*NX/2)
IF(MISSING(RUVAL)) RDVAL = RMISS
IF(MISSING(RDVAL)) RUVAL = RMISS
TARRAY(1+(J-1)*NX) = (RRVAL+RLVAL)*0.5
TARRAY(2+(J-1)*NX) = INOCEAN(1+(J-1)*NX/2)
DO 232 I = 1,NX/2
RUVAL = INOCEAN(I+(J-2)*NX/2)
RDVAL = INOCEAN(I+(J )*NX/2)
IF(MISSING(RUVAL)) RDVAL = RMISS
IF(MISSING(RDVAL)) RUVAL = RMISS
TARRAY(I*2-1+(J-1)*NX) = (RDVAL+RUVAL)*0.5
TARRAY(I*2 +(J-1)*NX) = INOCEAN(I+(J-1)*NX/2)
232 CONTINUE
C
RRVAL = INOCEAN(1+(1-1)*NX/2)
RLVAL = INOCEAN(NX/2+(1-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(1+(1-1)*NX) = (RRVAL+RLVAL)*0.5
TARRAY(2+(1-1)*NX) = INOCEAN(1+(1-1)*NX/2)
DO 233 I = 2,NX/2
RRVAL = INOCEAN(I+(1-1)*NX/2)
RLVAL = INOCEAN(I-1+(1-1)*NX/2)
IF(MISSING(RRVAL)) RLVAL = RMISS
IF(MISSING(RLVAL)) RRVAL = RMISS
TARRAY(I*2-1+(1-1)*NX) = (RRVAL+RLVAL)*0.5
TARRAY(I*2+(1-1)*NX) = INOCEAN(I+(1-1)*NX/2)
233 CONTINUE
DO 234 J = 1,NY
DO 234 I = 1,NX
INOCEAN(I+(J-1)*NX) = TARRAY(I+(J-1)*NX)
234 CONTINUE
C
C Reset the grid coordinate list if necessary, again making
C use of a temporary array. Expand the x-coordinate list,
C and remove the x coordinate of the first even point if
C grid is regular in x.
C
IF((IIRREG.EQ.1).OR.(IIRREG.EQ.3)) THEN
JSKIP = 0
DO 235 J = 1,NX/2
TARRAY(J*2-1) = OCCOOR(JSKIP+J)
TARRAY(J*2) = OCCOOR(JSKIP+NX/2+J)
235 CONTINUE
DO 236 J = 1,NX
OCCOOR(JSKIP+J) = TARRAY(J)
236 CONTINUE
ELSE IF((IIRREG.EQ.2)) THEN
DO 237 J = 1,NY
OCCOOR(J) = OCCOOR(1+J)
237 CONTINUE
ENDIF
C
C Staggered grid: interpolation in x and y.
C
ELSE IF(HSCODE.EQ.'F') THEN
ISTAGP = 5
CALL INTLOG(JP_ERROR,'INTOCNU: Staggered grid opt. F',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: (interpolate x and y)',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: not yet implemented.',JPQUIET)
INTOCNU = JPROUTINE + 1
GOTO 900
ELSE
CALL INTLOG(JP_ERROR,'INTOCNU: Staggered grid option',JPQUIET)
CALL INTLOG(JP_ERROR,HSCODE,JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: not known.',JPQUIET)
INTOCNU = JPROUTINE + 2
GOTO 900
ENDIF
C
ISTAG = 0
C
ELSE
ISTAGP = 0
ENDIF
C
C ------------------------------------------------------------------
C* Section 3 . Set X coordinates and interpolate in X.
C ------------------------------------------------------------------
C
300 CONTINUE
C
C The procedure is first to do the x interpolation (if any), and
C copy the result into a temporary array. The y interpolation is
C done in the next section.
C
C The one complication here is to ensure proper longitude wrap-round
C where appropriate.
C
C Some plot systems have difficulty controlling the data within the
C viewport. Because of this, and in the interests of efficiency, the
C data arrays are truncated even if no interpolation is being done.
C
C
C No interpolation in X.
C
IF((HICODE.EQ.'N').OR.
* ((HICODE.EQ.'R').AND.((IIRREG.EQ.0).OR.(IIRREG.EQ.2))).OR.
* (HICODE.EQ.'Y') ) THEN
C
C If x is longitude, set parameters up for wrap-round
C Wrap-round activated only if longitude range of data > 350 deg.
C
IF((IIRREG.EQ.0).OR.(IIRREG.EQ.2)) THEN
RXIRES = KXINC*XUNIT
NXLEFT = INTDN((RLEFT-KLON1*XUNIT)/RXIRES+1)
NXRIGH = INTUP((RRIGHT-KLON1*XUNIT)/RXIRES+1)
NXP = NXRIGH-NXLEFT+1
IF(NXP.LE.1) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: NXP negative = ',NXP)
INTOCNU = JPROUTINE + 3
GOTO 900
ENDIF
XARR(1) = KLON1*XUNIT+(NXLEFT-1)*RXIRES
XARR(2) = KXINC*XUNIT
XARR(3) = 0.0
cs Coordinate 3 flag (x-axis, usually longitude).
IF( (NIOCO3.EQ.3) .AND. (KXINC*NX*XUNIT.GT.350.0) ) THEN
IWRAP = 1
ELSE
IWRAP = 0
ENDIF
C
ELSE IF( (IIRREG.EQ.1) .OR. (IIRREG.EQ.3) ) THEN
NXP = NX
NXLEFT = 1
cs JSKIP = JGCL
JSKIP = 0
DO 312 JI = 1,NXP
XARR(JI) = OCCOOR(JSKIP+JI)*XUNIT
312 CONTINUE
cs Coordinate 3 flag (x-axis, usually longitude).
IF( (NIOCO3.EQ.3) .AND. (KXINC*NX*XUNIT.GT.350.0) ) THEN
IWRAP = 1
INTOCNU = JPROUTINE + 4
GOTO 900
ELSE
IWRAP = 0
ENDIF
ENDIF
C
IF((NXP*NY).GT.KLENI) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NY)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 5
GOTO 900
ENDIF
C
C Copy the data into the temporary array
C
DO 318 JI = 1,NXP
JIP = JI+NXLEFT-1
IF(IWRAP.EQ.1) THEN
IF(JIP.LE.0) JIP = JIP+NX
IF(JIP.GT.NX) JIP = JIP-NX
ENDIF
IF((JIP.GE.1).AND.(JIP.LE.NX)) THEN
DO 316 JJ = 1,NY
TARRAY(JI+(JJ-1)*NXP) = INOCEAN(JIP+(JJ-1)*NX)
316 CONTINUE
ELSE
DO 317 JJ = 1,NY
TARRAY(JI+(JJ-1)*NXP) = RMISS
317 CONTINUE
ENDIF
318 CONTINUE
C
C Interpolation from a grid irregular in X.
C ---------------------------------------------
C
ELSE IF(((HICODE.EQ.'R').OR.
* (HICODE.EQ.'X').OR.
* (HICODE.EQ.'F') ).AND.
* ((IIRREG.EQ.1).OR.(IIRREG.EQ.3)) ) THEN
XPSIGN = SIGN(1.0,(RRIGHT-RLEFT))
NXP = NINT((RRIGHT-RLEFT)/RXRES*XPSIGN)+1
IF((NXP*NY).GT.KLENI) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NY)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 6
GOTO 900
ENDIF
RRIGHT = RLEFT+RXRES*XPSIGN*(NXP-1)
XARR(1) = RLEFT
XARR(2) = RXRES*XPSIGN
XARR(3) = 0.0
IINTPOL = IINTPOL+1
IOFFSET = 0
XSIGN = SIGN(1.0,((OCCOOR(IOFFSET+2)-OCCOOR(IOFFSET+1))*1.0))
XRSIGN = XSIGN*XPSIGN
DO 321 JI = 1,NXP*NY
TARRAY(JI) = RMISS
321 CONTINUE
C
C Work through the known (irregular) data points.
C Calculate the position of the point as a fractional number of
C points on the new regular grid
C (XFPOSN). If there are any points on the new grid between this
C point and the previous one (XFPREV), then set these points by
C interpolation between the two known points.
XFPREV= (OCCOOR(IOFFSET+1)*XUNIT-RLEFT)/RXRES*XPSIGN- 0.5*XRSIGN
DO 324 JI = 1,NX
XFPOSN = (OCCOOR(IOFFSET+JI)*XUNIT-RLEFT)/(RXRES*XPSIGN)
NEWPTS = INTDN((XFPOSN*XRSIGN))-INTDN((XFPREV*XRSIGN))
DO 323 JN = 1,NEWPTS
IPOS = (INTDN(XFPREV*XRSIGN)+JN)*XRSIGN+1
RPOS = (IPOS-1)*1.0
IF((IPOS.GE.1).AND.(IPOS.LE.NXP)) THEN
DO 322 JJ = 1,NY
RVALL = INOCEAN(JI-1+NX*(JJ-1))
RVALR = INOCEAN(JI+NX*(JJ-1))
IF(.NOT.MISSING(RVALL) .AND. .NOT.MISSING(RVALR) ) THEN
XVAL = (XFPOSN-RPOS)/(XFPOSN-XFPREV)*RVALL
* +(RPOS-XFPREV)/(XFPOSN-XFPREV)*RVALR
ELSE
XVAL = RMISS
ENDIF
TARRAY(IPOS+NXP*(JJ-1)) = XVAL
322 CONTINUE
ENDIF
323 CONTINUE
XFPREV = XFPOSN
324 CONTINUE
C
C Interpolation from a grid regular in X.
C
ELSE IF(((HICODE.EQ.'X').OR.(HICODE.EQ.'F')).AND.
* ((IIRREG.EQ.0).OR.(IIRREG.EQ.2)) ) THEN
XPSIGN = SIGN(1.0,(RRIGHT-RLEFT))
NXP = NINT((RRIGHT-RLEFT)/RXRES*XPSIGN)+1
IF((NXP*NY).GT.KLENI) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NY)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 7
GOTO 900
ENDIF
RRIGHT = RLEFT+RXRES*XPSIGN*(NXP-1)
XARR(1) = RLEFT
XARR(2) = RXRES*XPSIGN
XARR(3) = 0.0
IINTPOL = IINTPOL+1
C
C Work through the new regular grid points. Calculate the position
C of the point as a fractional number of points on the old grid.
C Use this fractional number to estimate the value of the field
C at the new point
C
C (Note that just to the right of the first point, RPOS will be
C eg 1.1, not 0.1)
C
DO 330 JI = 1,NXP*NY
TARRAY(JI) = RMISS
330 CONTINUE
C
XOWEST = KLON1*XUNIT
XORES = KXINC*XUNIT
DO 3320 JI = 1,NXP
RPOS = (RLEFT+(JI-1)*RXRES-XOWEST)/XORES + 1
IPOS = INTDN(RPOS)
C
C Check for out of bounds, and set to zero unless x is
C longitude, in which case attempt to wrap round.
IF( (IPOS.GE.1) .AND. ((IPOS+1).LE.NX) ) THEN
DO 3310 JJ = 1,NY
RVALL = INOCEAN(IPOS+(JJ-1)*NX)
RVALR = INOCEAN(IPOS+1+(JJ-1)*NX)
IF(.NOT. MISSING(RVALL) .AND. .NOT. MISSING(RVALR) ) THEN
RVAL = (IPOS+1-RPOS)*RVALL + (RPOS-IPOS)*RVALR
C
C Do not set to missing if there is good data close by.
ELSEIF( (.NOT.MISSING(RVALL)) .AND.
X ((IPOS+1-RPOS).GT.0.5) ) THEN
RVAL = RVALL
ELSEIF( (.NOT. MISSING(RVALR)).AND.
X ((RPOS-IPOS).GT.0.5)) THEN
RVAL = RVALR
ELSE
RVAL = RMISS
ENDIF
TARRAY(JI+(JJ-1)*NXP) = RVAL
3310 CONTINUE
C
ELSEIF( NIOCO3.EQ.JP_LONG ) THEN
C
C This works only if the longitude points are equally spaced
C around the globe, ie the gap between the first and last
C points is equal to the gap between any other pair of
C adjacent points.
C
IPOSM = MOD(IPOS,NX)
IPOSP1M = MOD((IPOS+1),NX)
IF(IPOSM.LE.0) IPOSM = IPOSM+NX
IF(IPOSP1M.LE.0) IPOSP1M = IPOSP1M+NX
DO 3313 JJ = 1,NY
RVALL = INOCEAN(IPOSM+(JJ-1)*NX)
RVALR = INOCEAN(IPOSP1M+(JJ-1)*NX)
IF(.NOT. MISSING(RVALL) .AND. .NOT. MISSING(RVALR) ) THEN
RVAL = (IPOS+1-RPOS)*RVALL + (RPOS-IPOS)*RVALR
C
C Do not set to missing if there is good data close by.
ELSEIF( (.NOT.MISSING(RVALL)) .AND.
X ((IPOS+1-RPOS).GT.0.5) ) THEN
RVAL = RVALL
ELSEIF( (.NOT. MISSING(RVALR)).AND.
X ((RPOS-IPOS).GT.0.5) ) THEN
RVAL = RVALR
ELSE
RVAL = RMISS
ENDIF
IF(RVAL.GT.1E6) THEN
RVAL = RMISS
ENDIF
TARRAY(JI+(JJ-1)*NXP) = RVAL
3313 CONTINUE
ELSE
DO 3316 JJ = 1,NY
TARRAY(JI+(JJ-1)*NXP) = RMISS
3316 CONTINUE
ENDIF
3320 CONTINUE
C
ELSE
CALL INTLOG(JP_ERROR,'INTOCNU: Error in logic.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: HICODE = ',JPQUIET)
CALL INTLOG(JP_ERROR,HICODE,JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: IIRREG = ',IIRREG)
INTOCNU = JPROUTINE + 8
GOTO 900
ENDIF
C
C ------------------------------------------------------------------
C* Section 4 . Set Y coordinates and interpolate in Y.
C ------------------------------------------------------------------
C
400 CONTINUE
C
C The x-interpolated field in the temporary array is interpolated in
C y into the final output field array. Note that the field and the
C coordinate array are both inverted in the y direction during this
C section.
C
C Some plot systems have difficulty controlling the data within the
C viewport. Because of this, and in the interests of efficiency, the
C data arrays are truncated even if no interpolation is being done.
C
C
C No interpolation in Y.
C
IF((HICODE.EQ.'N').OR.
* ((HICODE.EQ.'R').AND.((IIRREG.EQ.0).OR.(IIRREG.EQ.1))).OR.
* (HICODE.EQ.'X') ) THEN
C
C If y is longitude, set parameters up for wrap-round
C Wrap-round activated only if longitude range of data > 350 deg.
C
IF((IIRREG.EQ.0).OR.(IIRREG.EQ.1)) THEN
C
C Remember to invert calc of NYP if RYIRES -ve ... 22.04.94
RYIRES = KYINC*YUNIT
IF(RYIRES.GT.0) THEN
NYLEFT = INTDN((RBOTT-KLAT1*YUNIT)/RYIRES+1)
NYRIGH = INTUP((RTOP-KLAT1*YUNIT)/RYIRES+1)
NYP = NYRIGH-NYLEFT+1
ELSE
NYRIGH = INTUP((RBOTT-KLAT1*YUNIT)/RYIRES+1)
NYLEFT = INTDN((RTOP-KLAT1*YUNIT)/RYIRES+1)
NYP = NYRIGH-NYLEFT+1
ENDIF
IF(NYP.LE.1) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: NYP negative = ',NYP)
INTOCNU = JPROUTINE + 9
GOTO 900
ENDIF
C
C Remember to invert yarr coordinates ... 06.07.93
YARR(1) = KLAT1*YUNIT+(NYRIGH-1)*RYIRES
YARR(2) = -KYINC*YUNIT
YARR(3) = 0.0
C
C Remember NYLEFT is relative to the inverted array ... 19.01.96
C ... but be careful to do this exactly. 01.04.97
NYLEFTI=NYLEFT
NYLEFT=NY+1-NYRIGH
NYRIGH=NY+1-NYLEFTI
C
IF((NIOCO4.EQ.3) .AND. (KYINC*NY*YUNIT.GT.350.0) ) THEN
IWRAP = 1
ELSE
IWRAP = 0
ENDIF
C
ELSE IF(IIRREG.EQ.2) THEN
IOFFSET = 0
YPSIGN = SIGN(1.0,(RTOP-RBOTT))
YSIGN = SIGN(1.0,((OCCOOR(IOFFSET+2)-OCCOOR(IOFFSET+1))*1.0))
YRSIGN = YSIGN*YPSIGN
JMIN = 0
DO 410 JI = 1,NY
YARR(JI) = OCCOOR((IOFFSET+NY+1-JI))*YUNIT
IF(YRSIGN.LT.0.0) THEN
IF((YARR(JI)-RBOTT)*YSIGN .GT. 0.0) JMIN = JI
IF((YARR(JI)-RTOP )*YSIGN .GT. 0.0) JMAX = JI+1
ELSE
IF((YARR(JI)-RTOP )*YSIGN .GT. 0.0) JMIN = JI
IF((YARR(JI)-RBOTT)*YSIGN .GT. 0.0) JMAX = JI+1
ENDIF
410 CONTINUE
IF(JMIN.EQ.0) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Domain out of range.',JPQUIET)
CALL INTLOGR(JP_ERROR,'INTOCNU: Requested Y = ',RBOTT)
CALL INTLOGR(JP_ERROR,'INTOCNU: Data limit of Y = ',YARR(1))
INTOCNU = JPROUTINE + 10
GOTO 900
ENDIF
IF(JMAX.EQ.NY+1) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Domain out of range.',JPQUIET)
CALL INTLOGR(JP_ERROR,'INTOCNU: Requested Y = ',RTOP)
CALL INTLOGR(JP_ERROR,'INTOCNU: Data limit of Y = ',YARR(NY))
INTOCNU = JPROUTINE + 11
GOTO 900
ENDIF
C
NYP = (JMAX-JMIN)+1
NYLEFT = JMIN
DO 411 JI = 1,NYP
YARR(JI) = YARR(JI+(NYLEFT-1))
411 CONTINUE
C
IF((NIOCO4.EQ.3) .AND. (KYINC*NY*YUNIT.GT.350.0) ) THEN
IWRAP = 1
CALL INTLOG(JP_ERROR,'INTOCNU: Irregular wrap-round',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: not yet implemented.',JPQUIET)
INTOCNU = JPROUTINE + 12
GOTO 900
ELSE
IWRAP = 0
ENDIF
C
ELSE IF(IIRREG.EQ.3) THEN
NYP = NY
NYLEFT = 1
JSKIP = NX
DO 412 JI = 1,NYP
YARR(JI) = OCCOOR(JSKIP+(NY+1-JI))*YUNIT
412 CONTINUE
IF((NIOCO4.EQ.3) .AND. (KYINC*NY*YUNIT.GT.350.0) ) THEN
IWRAP = 1
CALL INTLOG(JP_ERROR,'INTOCNU: Irregular wrap-round',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: not yet implemented.',JPQUIET)
INTOCNU = JPROUTINE + 13
GOTO 900
ELSE
IWRAP = 0
ENDIF
ENDIF
C
IF((NXP*NYP).GT.KLENI) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NYP)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 14
GOTO 900
ENDIF
C
C Copy the data into the temporary array, and invert it at
C same time.
C Note: NYLEFT is the starting index in the inverted data array.
C
c DO 416 JJ = 1,NYP
c DO 414 JI = 1,NXP
c PARRAY(JI+(JJ-1)*NXP) = TARRAY(JI+(NY-JJ)*NXP)
c 414 CONTINUE
c 416 CONTINUE
C
DO 418 JJ = 1,NYP
cc JJP = JJ+NYLEFT-1
JLEFT = NY-(NYLEFT-1)
JJP = JLEFT-JJ+1
IF(IWRAP.EQ.1) THEN
IF(JJP.LE.0) JJP = JJP+NY
IF(JJP.GT.NY) JJP = JJP-NY
ENDIF
IF((JJP.GE.1).AND.(JJP.LE.NY)) THEN
DO 416 JI = 1,NXP
cc PARRAY(JI+(NYP-JJ)*NXP) = TARRAY(JI+(JJP-1)*NXP)
PARRAY(JI+(JJ-1)*NXP) = TARRAY(JI+(JJP-1)*NXP)
416 CONTINUE
ELSE
DO 417 JI = 1,NXP
PARRAY(JI+(NYP-JJ)*NXP) = RMISS
417 CONTINUE
ENDIF
418 CONTINUE
C
C Interpolation from a grid irregular in Y.
C
ELSE IF(((HICODE.EQ.'R').OR.
* (HICODE.EQ.'Y').OR.
* (HICODE.EQ.'F') ).AND.
* ((IIRREG.EQ.2).OR.(IIRREG.EQ.3)) ) THEN
YPSIGN = SIGN(1.0,(RTOP-RBOTT))
IF( YPSIGN.GT.0 ) THEN
NYP = NINT((RTOP-RBOTT+ 0.0001)/RYRES)+1
ELSE
NYP = NINT((RBOTT-RTOP + 0.0001)/RYRES)+1
ENDIF
Cjdc NYP = NINT((RTOP-RBOTT)/RYRES*YPSIGN)+1
IF((NXP*NYP).GT.KLENI) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NYP)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 15
GOTO 900
ENDIF
RTOP = RBOTT+RYRES*YPSIGN*(NYP-1)
YARR(1) = RBOTT
YARR(2) = RYRES*YPSIGN
YARR(3) = 0.0
IINTPOL = IINTPOL+2
IF(IIRREG.EQ.2) THEN
IOFFSET = 0
ELSE IF(IIRREG.EQ.3) THEN
IOFFSET = NX
ENDIF
YSIGN = SIGN(1.0,((OCCOOR(IOFFSET+2)-OCCOOR(IOFFSET+1))*1.0))
YRSIGN = YSIGN*YPSIGN
DO 420 JI = 1,NXP*NYP
PARRAY(JI) = RMISS
420 CONTINUE
C
C Work through the known (irregular) data points. Calculate the
C position of the point as a fractional number of points on the
C new regular grid (YFPOSN). If there are any points on the new
C grid between this point and the previous one (YFPREV), then set
C these points by interpolation between the two known points.
C Check that the points are in range.
C Note that we are willing to overlap slightly at the start, but
C must fiddle the array arguments to do this.
C
YFPREV= (OCCOOR(IOFFSET+1)*YUNIT-RBOTT)/RYRES*YPSIGN- 0.5*YRSIGN
DO 428 JJ = 1,NY
YFPOSN = (OCCOOR(IOFFSET+JJ)*YUNIT-RBOTT)/RYRES*YPSIGN
NEWPTS = INTDN((YFPOSN*YRSIGN)) -INTDN((YFPREV*YRSIGN))
C
C INT truncates toward zero;
C INTDN truncates downwards in all cases
C
DO 426 JN = 1,NEWPTS
IPOS = (INTDN(YFPREV*YRSIGN)+JN)*YRSIGN+1
RPOS = (IPOS-1)*1.0
IF((IPOS.GE.1).AND.(IPOS.LE.NYP)) THEN
JJEFF = JJ
IF(JJ.EQ.1) JJEFF = 2
DO 424 JI = 1,NXP
RVALL = TARRAY(JI+NXP*(JJEFF-2))
RVALR = TARRAY(JI+NXP*(JJ-1))
IF(.NOT.MISSING(RVALL) .AND. .NOT.MISSING(RVALR) ) THEN
XVAL = (YFPOSN-RPOS)/(YFPOSN-YFPREV)*RVALL
* +(RPOS-YFPREV)/(YFPOSN-YFPREV)*RVALR
ELSE
XVAL = RMISS
ENDIF
PARRAY(JI+NXP*(IPOS-1)) = XVAL
424 CONTINUE
ENDIF
426 CONTINUE
YFPREV = YFPOSN
428 CONTINUE
C
C
C
C 4.3 INTERPOLATION FROM A GRID REGULAR IN Y
C -------------------------------------------
C
ELSEIF(((HICODE.EQ.'Y').OR.(HICODE.EQ.'F')).AND.
* ((IIRREG.EQ.0).OR.(IIRREG.EQ.1)) ) THEN
LNEAREST=.TRUE.
YPSIGN=SIGN(1.,(RTOP-RBOTT))
NYP=NINT((RTOP-RBOTT)/RYRES*YPSIGN)+1
IF((NXP*NYP).GT.KLENI) THEN
CALL INTLOG(JP_ERROR,'INTOCNU: Array too small.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: Required = ',NXP*NYP)
CALL INTLOG(JP_ERROR,'INTOCNU: Available = ',KLENI)
INTOCNU = JPROUTINE + 19
GOTO 900
ENDIF
RTOP=RBOTT+RYRES*(NYP-1)*YPSIGN
YARR(1)=RBOTT
YARR(2)=RYRES*YPSIGN
YARR(3)=0.0
C Work through the new regular grid points. Calculate the position of
C the point as a fractional number of points on the old grid. Use this
C fractional number to estimate the value of the field at the new point
IINTPOL=IINTPOL+2
DO 335 JI=1,NXP*NYP
PARRAY(JI)=RMISS
335 CONTINUE
XOSOUT=KLAT1*YUNIT
XORES =KYINC*YUNIT
DO 3370 JJ=1,NYP
RPOS=(RBOTT+(JJ-1)*RYRES*YPSIGN-XOSOUT)/XORES + 1
JPOS=INTDN(RPOS)
C Check for out of bounds, and set to missing if this is the case
IF((JPOS.GE.1).AND.(JPOS+1.LE.NY)) THEN
DO 3360 JI=1,NXP
RVALB = TARRAY(JI+(JPOS-1)*NXP)
RVALT = TARRAY(JI+(JPOS+1-1)*NXP)
IF(.NOT.MISSING(RVALB).AND.
* .NOT.MISSING(RVALT) ) THEN
RVAL=(JPOS+1-RPOS)*RVALB
* +(RPOS-JPOS)*RVALT
ELSEIF(LNEAREST) THEN
IF((.NOT.MISSING(RVALB)) .AND.
* ((JPOS+1-RPOS).GT.0.5) ) THEN
RVAL=RVALB
ELSEIF((.NOT.MISSING(RVALT)).AND.
* ((RPOS-JPOS).GT.0.5) ) THEN
RVAL=RVALT
ELSE
RVAL=RMISS
ENDIF
ELSE
RVAL=RMISS
ENDIF
PARRAY(JI+(JJ-1)*NXP)=RVAL
3360 CONTINUE
ELSE
DO 3365 JI=1,NXP
PARRAY(JI+(JJ-1)*NXP)=RMISS
3365 CONTINUE
ENDIF
3370 CONTINUE
C
C
ELSE
CALL INTLOG(JP_ERROR,'INTOCNU: Error in logic.',JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: HICODE = ',JPQUIET)
CALL INTLOG(JP_ERROR,HICODE,JPQUIET)
CALL INTLOG(JP_ERROR,'INTOCNU: IIRREG = ',IIRREG)
INTOCNU = JPROUTINE + 16
GOTO 900
ENDIF
C
C ------------------------------------------------------------------
C* Section 9 . Return.
C ------------------------------------------------------------------
C
900 CONTINUE
C
C
RETURN
END
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