C----------------------------------------------------------------------- SUBROUTINE POLATES2(IPOPT,KGDSI,KGDSO,MI,MO,KM,IBI,LI,GI, & NO,RLAT,RLON,IBO,LO,GO,IRET) C$$$ SUBPROGRAM DOCUMENTATION BLOCK C C SUBPROGRAM: POLATES2 INTERPOLATE SCALAR FIELDS (NEIGHBOR) C PRGMMR: IREDELL ORG: W/NMC23 DATE: 96-04-10 C C ABSTRACT: THIS SUBPROGRAM PERFORMS NEIGHBOR INTERPOLATION C FROM ANY GRID TO ANY GRID FOR SCALAR FIELDS. C OPTIONS ALLOW CHOOSING THE WIDTH OF THE GRID SQUARE C (IPOPT(1)) TO SEARCH FOR VALID DATA, WHICH DEFAULTS TO 1 C (IF IPOPT(1)=-1). ODD WIDTH SQUARES ARE CENTERED ON C THE NEAREST INPUT GRID POINT; EVEN WIDTH SQUARES ARE C CENTERED ON THE NEAREST FOUR INPUT GRID POINTS. C SQUARES ARE SEARCHED FOR VALID DATA IN A SPIRAL PATTERN C STARTING FROM THE CENTER. NO SEARCHING IS DONE WHERE C THE OUTPUT GRID IS OUTSIDE THE INPUT GRID. C ONLY HORIZONTAL INTERPOLATION IS PERFORMED. C THE GRIDS ARE DEFINED BY THEIR GRID DESCRIPTION SECTIONS C (PASSED IN INTEGER FORM AS DECODED BY SUBPROGRAM W3FI63). C THE CURRENT CODE RECOGNIZES THE FOLLOWING PROJECTIONS: C (KGDS(1)=000) EQUIDISTANT CYLINDRICAL C (KGDS(1)=001) MERCATOR CYLINDRICAL C (KGDS(1)=003) LAMBERT CONFORMAL CONICAL C (KGDS(1)=004) GAUSSIAN CYLINDRICAL (SPECTRAL NATIVE) C (KGDS(1)=005) POLAR STEREOGRAPHIC AZIMUTHAL C (KGDS(1)=202) ROTATED EQUIDISTANT CYLINDRICAL (ETA NATIVE) C WHERE KGDS COULD BE EITHER INPUT KGDSI OR OUTPUT KGDSO. C AS AN ADDED BONUS THE NUMBER OF OUTPUT GRID POINTS C AND THEIR LATITUDES AND LONGITUDES ARE ALSO RETURNED. C ON THE OTHER HAND, THE OUTPUT CAN BE A SET OF STATION POINTS C IF KGDSO(1)<0, IN WHICH CASE THE NUMBER OF POINTS C AND THEIR LATITUDES AND LONGITUDES MUST BE INPUT. C INPUT BITMAPS WILL BE INTERPOLATED TO OUTPUT BITMAPS. C OUTPUT BITMAPS WILL ALSO BE CREATED WHEN THE OUTPUT GRID C EXTENDS OUTSIDE OF THE DOMAIN OF THE INPUT GRID. C THE OUTPUT FIELD IS SET TO 0 WHERE THE OUTPUT BITMAP IS OFF. C C PROGRAM HISTORY LOG: C 96-04-10 IREDELL C 1999-04-08 IREDELL SPLIT IJKGDS INTO TWO PIECES C 2001-06-18 IREDELL INCLUDE SPIRAL SEARCH OPTION C 2006-01-04 GAYNO MINOR BUG FIX C 2007-10-30 IREDELL SAVE WEIGHTS AND THREAD FOR PERFORMANCE C C USAGE: CALL POLATES2(IPOPT,KGDSI,KGDSO,MI,MO,KM,IBI,LI,GI, C & NO,RLAT,RLON,IBO,LO,GO,IRET) C C INPUT ARGUMENT LIST: C IPOPT - INTEGER (20) INTERPOLATION OPTIONS C IPOPT(1) IS WIDTH OF SQUARE TO EXAMINE IN SPIRAL SEARCH C (DEFAULTS TO 1 IF IPOPT(1)=-1) C KGDSI - INTEGER (200) INPUT GDS PARAMETERS AS DECODED BY W3FI63 C KGDSO - INTEGER (200) OUTPUT GDS PARAMETERS C (KGDSO(1)<0 IMPLIES RANDOM STATION POINTS) C MI - INTEGER SKIP NUMBER BETWEEN INPUT GRID FIELDS IF KM>1 C OR DIMENSION OF INPUT GRID FIELDS IF KM=1 C MO - INTEGER SKIP NUMBER BETWEEN OUTPUT GRID FIELDS IF KM>1 C OR DIMENSION OF OUTPUT GRID FIELDS IF KM=1 C KM - INTEGER NUMBER OF FIELDS TO INTERPOLATE C IBI - INTEGER (KM) INPUT BITMAP FLAGS C LI - LOGICAL*1 (MI,KM) INPUT BITMAPS (IF SOME IBI(K)=1) C GI - REAL (MI,KM) INPUT FIELDS TO INTERPOLATE C NO - INTEGER NUMBER OF OUTPUT POINTS (ONLY IF KGDSO(1)<0) C RLAT - REAL (NO) OUTPUT LATITUDES IN DEGREES (IF KGDSO(1)<0) C RLON - REAL (NO) OUTPUT LONGITUDES IN DEGREES (IF KGDSO(1)<0) C C OUTPUT ARGUMENT LIST: C NO - INTEGER NUMBER OF OUTPUT POINTS (ONLY IF KGDSO(1)>=0) C RLAT - REAL (MO) OUTPUT LATITUDES IN DEGREES (IF KGDSO(1)>=0) C RLON - REAL (MO) OUTPUT LONGITUDES IN DEGREES (IF KGDSO(1)>=0) C IBO - INTEGER (KM) OUTPUT BITMAP FLAGS C LO - LOGICAL*1 (MO,KM) OUTPUT BITMAPS (ALWAYS OUTPUT) C GO - REAL (MO,KM) OUTPUT FIELDS INTERPOLATED C IRET - INTEGER RETURN CODE C 0 SUCCESSFUL INTERPOLATION C 2 UNRECOGNIZED INPUT GRID OR NO GRID OVERLAP C 3 UNRECOGNIZED OUTPUT GRID C C SUBPROGRAMS CALLED: C GDSWIZ GRID DESCRIPTION SECTION WIZARD C IJKGDS0 SET UP PARAMETERS FOR IJKGDS1 C (IJKGDS1) RETURN FIELD POSITION FOR A GIVEN GRID POINT C POLFIXS MAKE MULTIPLE POLE SCALAR VALUES CONSISTENT C C ATTRIBUTES: C LANGUAGE: FORTRAN 77 C C$$$ IMPLICIT NONE INTEGER,INTENT(IN):: IPOPT(20),KGDSI(200),KGDSO(200),MI,MO,KM INTEGER,INTENT(IN):: IBI(KM) LOGICAL*1,INTENT(IN):: LI(MI,KM) REAL,INTENT(IN):: GI(MI,KM) INTEGER,INTENT(INOUT):: NO REAL,INTENT(INOUT):: RLAT(MO),RLON(MO) INTEGER,INTENT(OUT):: IBO(KM) LOGICAL*1,INTENT(OUT):: LO(MO,KM) REAL,INTENT(OUT):: GO(MO,KM) INTEGER,INTENT(OUT):: IRET REAL XPTS(MO),YPTS(MO) INTEGER IJKGDSA(20) REAL,PARAMETER:: FILL=-9999. INTEGER MSPIRAL,N,K,NK,NV,IJKGDS1 INTEGER I1,J1,IXS,JXS,MX,KXS,KXT,IX,JX,NX REAL DUM INTEGER,SAVE:: KGDSIX(200)=-1,KGDSOX(200)=-1,NOX=-1,IRETX=-1 INTEGER,ALLOCATABLE,SAVE:: NXY(:) REAL,ALLOCATABLE,SAVE:: RLATX(:),RLONX(:),XPTSX(:),YPTSX(:) C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C SET PARAMETERS IRET=0 MSPIRAL=MAX(IPOPT(1),1) C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C SAVE OR SKIP WEIGHT COMPUTATION IF(IRET.EQ.0.AND.(KGDSO(1).LT.0.OR. & ANY(KGDSI.NE.KGDSIX).OR.ANY(KGDSO.NE.KGDSOX))) THEN C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C COMPUTE NUMBER OF OUTPUT POINTS AND THEIR LATITUDES AND LONGITUDES. IF(KGDSO(1).GE.0) THEN CALL GDSWIZ(KGDSO, 0,MO,FILL,XPTS,YPTS,RLON,RLAT,NO,0,DUM,DUM) IF(NO.EQ.0) IRET=3 ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C LOCATE INPUT POINTS CALL GDSWIZ(KGDSI,-1,NO,FILL,XPTS,YPTS,RLON,RLAT,NV,0,DUM,DUM) IF(IRET.EQ.0.AND.NV.EQ.0) IRET=2 C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C ALLOCATE AND SAVE GRID DATA KGDSIX=KGDSI KGDSOX=KGDSO IF(NOX.NE.NO) THEN IF(NOX.GE.0) DEALLOCATE(RLATX,RLONX,XPTSX,YPTSX,NXY) ALLOCATE(RLATX(NO),RLONX(NO),XPTSX(NO),YPTSX(NO),NXY(NO)) NOX=NO ENDIF IRETX=IRET C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C COMPUTE WEIGHTS IF(IRET.EQ.0) THEN CALL IJKGDS0(KGDSI,IJKGDSA) C$OMP PARALLEL DO C$OMP&PRIVATE(N) DO N=1,NO RLONX(N)=RLON(N) RLATX(N)=RLAT(N) XPTSX(N)=XPTS(N) YPTSX(N)=YPTS(N) IF(XPTS(N).NE.FILL.AND.YPTS(N).NE.FILL) THEN NXY(N)=IJKGDS1(NINT(XPTS(N)),NINT(YPTS(N)),IJKGDSA) ELSE NXY(N)=0 ENDIF ENDDO ENDIF ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C INTERPOLATE OVER ALL FIELDS IF(IRET.EQ.0.AND.IRETX.EQ.0) THEN IF(KGDSO(1).GE.0) THEN NO=NOX DO N=1,NO RLON(N)=RLONX(N) RLAT(N)=RLATX(N) ENDDO ENDIF DO N=1,NO XPTS(N)=XPTSX(N) YPTS(N)=YPTSX(N) ENDDO C$OMP PARALLEL DO C$OMP&PRIVATE(NK,K,N,I1,J1,IXS,JXS,MX,KXS,KXT,IX,JX,NX) DO NK=1,NO*KM K=(NK-1)/NO+1 N=NK-NO*(K-1) GO(N,K)=0 LO(N,K)=.FALSE. IF(NXY(N).GT.0) THEN IF(IBI(K).EQ.0.OR.LI(NXY(N),K)) THEN GO(N,K)=GI(NXY(N),K) LO(N,K)=.TRUE. C SPIRAL AROUND UNTIL VALID DATA IS FOUND. ELSEIF(MSPIRAL.GT.1) THEN I1=NINT(XPTS(N)) J1=NINT(YPTS(N)) IXS=SIGN(1.,XPTS(N)-I1) JXS=SIGN(1.,YPTS(N)-J1) DO MX=2,MSPIRAL**2 KXS=SQRT(4*MX-2.5) KXT=MX-(KXS**2/4+1) SELECT CASE(MOD(KXS,4)) CASE(1) IX=I1-IXS*(KXS/4-KXT) JX=J1-JXS*KXS/4 CASE(2) IX=I1+IXS*(1+KXS/4) JX=J1-JXS*(KXS/4-KXT) CASE(3) IX=I1+IXS*(1+KXS/4-KXT) JX=J1+JXS*(1+KXS/4) CASE DEFAULT IX=I1-IXS*KXS/4 JX=J1+JXS*(KXS/4-KXT) END SELECT NX=IJKGDS1(IX,JX,IJKGDSA) IF(NX.GT.0.AND.LI(NX,K)) THEN GO(N,K)=GI(NX,K) LO(N,K)=.TRUE. EXIT ENDIF ENDDO ENDIF ENDIF ENDDO DO K=1,KM IBO(K)=IBI(K) IF(.NOT.ALL(LO(1:NO,K))) IBO(K)=1 ENDDO IF(KGDSO(1).EQ.0) CALL POLFIXS(NO,MO,KM,RLAT,RLON,IBO,LO,GO) C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ELSE IF(IRET.EQ.0) IRET=IRETX IF(KGDSO(1).GE.0) NO=0 ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END