SUBROUTINE POLATES1(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,GI, & NO,RLAT,RLON,IBO,LO,GO,IRET) !$$$ SUBPROGRAM DOCUMENTATION BLOCK ! ! $Revision: 74685 $ ! ! SUBPROGRAM: POLATES1 INTERPOLATE SCALAR FIELDS (BICUBIC) ! PRGMMR: IREDELL ORG: W/NMC23 DATE: 96-04-10 ! ! ABSTRACT: THIS SUBPROGRAM PERFORMS BICUBIC INTERPOLATION ! FROM ANY GRID TO ANY GRID FOR SCALAR FIELDS. ! BITMAPS ARE NOW ALLOWED EVEN WHEN INVALID POINTS ARE WITHIN ! THE BICUBIC TEMPLATE PROVIDED THE MINIMUM WEIGHT IS REACHED. ! OPTIONS ALLOW CHOICES BETWEEN STRAIGHT BICUBIC (IPOPT(1)=0) ! AND CONSTRAINED BICUBIC (IPOPT(1)=1) WHERE THE VALUE IS ! CONFINED WITHIN THE RANGE OF THE SURROUNDING 16 POINTS. ! ANOTHER OPTION IS THE MINIMUM PERCENTAGE FOR MASK, ! I.E. PERCENT VALID INPUT DATA REQUIRED TO MAKE OUTPUT DATA, ! (IPOPT(2)) WHICH DEFAULTS TO 50 (IF IPOPT(2)=-1). ! BILINEAR USED WITHIN ONE GRID LENGTH OF BOUNDARIES. ! ONLY HORIZONTAL INTERPOLATION IS PERFORMED. ! THE CODE RECOGNIZES THE FOLLOWING PROJECTIONS, WHERE ! "IGDTNUMI/O" IS THE GRIB 2 GRID DEFINTION TEMPLATE NUMBER ! FOR THE INPUT AND OUTPUT GRIDS, RESPECTIVELY: ! (IGDTNUMI/O=00) EQUIDISTANT CYLINDRICAL ! (IGDTNUMI/O=01) ROTATED EQUIDISTANT CYLINDRICAL. "E" AND ! NON-"E" STAGGERED ! (IGDTNUMI/O=10) MERCATOR CYLINDRICAL ! (IGDTNUMI/O=20) POLAR STEREOGRAPHIC AZIMUTHAL ! (IGDTNUMI/O=30) LAMBERT CONFORMAL CONICAL ! (IGDTNUMI/O=40) GAUSSIAN CYLINDRICAL ! AS AN ADDED BONUS THE NUMBER OF OUTPUT GRID POINTS ! AND THEIR LATITUDES AND LONGITUDES ARE ALSO RETURNED. ! ON THE OTHER HAND, THE OUTPUT CAN BE A SET OF STATION POINTS ! IF IGDTNUMO<0, IN WHICH CASE THE NUMBER OF POINTS ! AND THEIR LATITUDES AND LONGITUDES MUST BE INPUT. ! OUTPUT BITMAPS WILL ONLY BE CREATED WHEN THE OUTPUT GRID ! EXTENDS OUTSIDE OF THE DOMAIN OF THE INPUT GRID. ! THE OUTPUT FIELD IS SET TO 0 WHERE THE OUTPUT BITMAP IS OFF. ! ! PROGRAM HISTORY LOG: ! 96-04-10 IREDELL ! 1999-04-08 IREDELL SPLIT IJKGDS INTO TWO PIECES ! 2001-06-18 IREDELL INCLUDE MINIMUM MASK PERCENTAGE OPTION ! 2007-05-22 IREDELL EXTRAPOLATE UP TO HALF A GRID CELL ! 2007-10-30 IREDELL CORRECT NORTH POLE INDEXING PROBLEM, ! UNIFY MASKED AND NON-MASKED ALGORITHMS, ! AND SAVE WEIGHTS FOR PERFORMANCE. ! 2012-06-26 GAYNO FIX OUT-OF-BOUNDS ERROR. SEE NCEPLIBS ! TICKET #9. ! 2015-01-27 GAYNO REPLACE CALLS TO GDSWIZ WITH NEW MERGED ! VERSION OF GDSWZD. ! 2015-07-13 GAYNO CONVERT TO GRIB 2. REPLACE GRIB 1 KGDS ARRAYS ! WITH GRIB 2 GRID DEFINITION TEMPLATE ARRAYS. ! ! USAGE: CALL POLATES1(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & ! IGDTNUMO,IGDTMPLO,IGDTLENO, & ! MI,MO,KM,IBI,LI,GI, & ! NO,RLAT,RLON,IBO,LO,GO,IRET) ! ! INPUT ARGUMENT LIST: ! IPOPT - INTEGER (20) INTERPOLATION OPTIONS ! IPOPT(1)=0 FOR STRAIGHT BICUBIC; ! IPOPT(1)=1 FOR CONSTRAINED BICUBIC WHERE VALUE IS ! CONFINED WITHIN THE RANGE OF THE SURROUNDING 4 POINTS. ! IPOPT(2) IS MINIMUM PERCENTAGE FOR MASK ! (DEFAULTS TO 50 IF IPOPT(2)=-1) ! IGDTNUMI - INTEGER GRID DEFINITION TEMPLATE NUMBER - INPUT GRID. ! CORRESPONDS TO THE GFLD%IGDTNUM COMPONENT OF THE ! NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE: ! 00 - EQUIDISTANT CYLINDRICAL ! 01 - ROTATED EQUIDISTANT CYLINDRICAL. "E" ! AND NON-"E" STAGGERED ! 10 - MERCATOR CYCLINDRICAL ! 20 - POLAR STEREOGRAPHIC AZIMUTHAL ! 30 - LAMBERT CONFORMAL CONICAL ! 40 - GAUSSIAN EQUIDISTANT CYCLINDRICAL ! IGDTMPLI - INTEGER (IGDTLENI) GRID DEFINITION TEMPLATE ARRAY - ! INPUT GRID. CORRESPONDS TO THE GFLD%IGDTMPL COMPONENT ! OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE ! (SECTION 3 INFO). SEE COMMENTS IN ROUTINE ! IPOLATES FOR COMPLETE DEFINITION. ! IGDTLENI - INTEGER NUMBER OF ELEMENTS OF THE GRID DEFINITION ! TEMPLATE ARRAY - INPUT GRID. CORRESPONDS TO THE GFLD%IGDTLEN ! COMPONENT OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! IGDTNUMO - INTEGER GRID DEFINITION TEMPLATE NUMBER - OUTPUT GRID. ! CORRESPONDS TO THE GFLD%IGDTNUM COMPONENT OF THE ! NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. IGDTNUMO<0 ! MEANS INTERPOLATE TO RANDOM STATION POINTS. ! OTHERWISE, SAME DEFINITION AS "IGDTNUMI". ! IGDTMPLO - INTEGER (IGDTLENO) GRID DEFINITION TEMPLATE ARRAY - ! OUTPUT GRID. CORRESPONDS TO THE GFLD%IGDTMPL COMPONENT ! OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! (SECTION 3 INFO). SEE COMMENTS IN ROUTINE ! IPOLATES FOR COMPLETE DEFINITION. ! IGDTLENO - INTEGER NUMBER OF ELEMENTS OF THE GRID DEFINITION ! TEMPLATE ARRAY - OUTPUT GRID. CORRESPONDS TO THE GFLD%IGDTLEN ! COMPONENT OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! MI - INTEGER SKIP NUMBER BETWEEN INPUT GRID FIELDS IF KM>1 ! OR DIMENSION OF INPUT GRID FIELDS IF KM=1 ! MO - INTEGER SKIP NUMBER BETWEEN OUTPUT GRID FIELDS IF KM>1 ! OR DIMENSION OF OUTPUT GRID FIELDS IF KM=1 ! KM - INTEGER NUMBER OF FIELDS TO INTERPOLATE ! IBI - INTEGER (KM) INPUT BITMAP FLAGS ! LI - LOGICAL*1 (MI,KM) INPUT BITMAPS (IF SOME IBI(K)=1) ! GI - REAL (MI,KM) INPUT FIELDS TO INTERPOLATE ! NO - INTEGER NUMBER OF OUTPUT POINTS (ONLY IF IGDTNUMO<0) ! RLAT - REAL (NO) OUTPUT LATITUDES IN DEGREES (IF IGDTNUMO<0) ! RLON - REAL (NO) OUTPUT LONGITUDES IN DEGREES (IF IGDTNUMO<0) ! ! OUTPUT ARGUMENT LIST: ! NO - INTEGER NUMBER OF OUTPUT POINTS (ONLY IF IGDTNUMO>=0) ! RLAT - REAL (MO) OUTPUT LATITUDES IN DEGREES (IF IGDTNUMO>=0) ! RLON - REAL (MO) OUTPUT LONGITUDES IN DEGREES (IF IGDTNUMO>=0) ! IBO - INTEGER (KM) OUTPUT BITMAP FLAGS ! LO - LOGICAL*1 (MO,KM) OUTPUT BITMAPS (ALWAYS OUTPUT) ! GO - REAL (MO,KM) OUTPUT FIELDS INTERPOLATED ! IRET - INTEGER RETURN CODE ! 0 SUCCESSFUL INTERPOLATION ! 2 UNRECOGNIZED INPUT GRID OR NO GRID OVERLAP ! 3 UNRECOGNIZED OUTPUT GRID ! ! SUBPROGRAMS CALLED: ! GDSWZD GRID DESCRIPTION SECTION WIZARD ! IJKGDS0 SET UP PARAMETERS FOR IJKGDS1 ! IJKGDS1 RETURN FIELD POSITION FOR A GIVEN GRID POINT ! POLFIXS MAKE MULTIPLE POLE SCALAR VALUES CONSISTENT ! CHECK_GRIDS1 DETERMINE IF INPUT OR OUTPUT GRIDS HAVE CHANGED ! BETWEEN CALLS TO THIS ROUTINE. ! ! ATTRIBUTES: ! LANGUAGE: FORTRAN 90 ! !$$$ ! USE GDSWZD_MOD ! IMPLICIT NONE ! INTEGER, INTENT(IN ) :: IGDTNUMI, IGDTLENI INTEGER, INTENT(IN ) :: IGDTMPLI(IGDTLENI) INTEGER, INTENT(IN ) :: IGDTNUMO, IGDTLENO INTEGER, INTENT(IN ) :: IGDTMPLO(IGDTLENO) INTEGER, INTENT(IN ) :: IPOPT(20) INTEGER, INTENT(IN ) :: MI,MO,KM INTEGER, INTENT(IN ) :: IBI(KM) INTEGER, INTENT(INOUT) :: NO INTEGER, INTENT( OUT) :: IRET, IBO(KM) ! LOGICAL*1, INTENT(IN ) :: LI(MI,KM) LOGICAL*1, INTENT( OUT) :: LO(MO,KM) ! REAL, INTENT(IN ) :: GI(MI,KM) REAL, INTENT(INOUT) :: RLAT(MO),RLON(MO) REAL, INTENT( OUT) :: GO(MO,KM) ! REAL, PARAMETER :: FILL=-9999. ! INTEGER :: IJKGDSA(20) INTEGER :: IJX(4),IJY(4) INTEGER :: MCON,MP,N,I,J,K INTEGER :: NK,NV,IJKGDS1 INTEGER, SAVE :: NOX=-1,IRETX=-1 INTEGER, ALLOCATABLE,SAVE :: NXY(:,:,:),NC(:) ! LOGICAL :: SAME_GRIDI, SAME_GRIDO ! REAL :: PMP,XIJ,YIJ,XF,YF REAL :: G,W,GMIN,GMAX REAL :: WX(4),WY(4) REAL :: XPTS(MO),YPTS(MO) REAL, ALLOCATABLE,SAVE :: RLATX(:),RLONX(:),WXY(:,:,:) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! SET PARAMETERS IRET=0 MCON=IPOPT(1) MP=IPOPT(2) IF(MP.EQ.-1.OR.MP.EQ.0) MP=50 IF(MP.LT.0.OR.MP.GT.100) IRET=32 PMP=MP*0.01 ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - CALL CHECK_GRIDS1(IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & SAME_GRIDI,SAME_GRIDO) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! SAVE OR SKIP WEIGHT COMPUTATION IF(IRET.EQ.0.AND.(IGDTNUMO.LT.0.OR..NOT.SAME_GRIDI.OR..NOT.SAME_GRIDO))THEN ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! COMPUTE NUMBER OF OUTPUT POINTS AND THEIR LATITUDES AND LONGITUDES. IF(IGDTNUMO.GE.0) THEN CALL GDSWZD(IGDTNUMO,IGDTMPLO,IGDTLENO, 0,MO,FILL,XPTS,YPTS,RLON,RLAT,NO) IF(NO.EQ.0) IRET=3 ENDIF ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! LOCATE INPUT POINTS CALL GDSWZD(IGDTNUMI,IGDTMPLI,IGDTLENI,-1,NO,FILL,XPTS,YPTS,RLON,RLAT,NV) IF(IRET.EQ.0.AND.NV.EQ.0) IRET=2 ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! ALLOCATE AND SAVE GRID DATA IF(NOX.NE.NO) THEN IF(NOX.GE.0) DEALLOCATE(RLATX,RLONX,NC,NXY,WXY) ALLOCATE(RLATX(NO),RLONX(NO),NC(NO),NXY(4,4,NO),WXY(4,4,NO)) NOX=NO ENDIF IRETX=IRET ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! COMPUTE WEIGHTS IF(IRET.EQ.0) THEN CALL IJKGDS0(IGDTNUMI,IGDTMPLI,IGDTLENI,IJKGDSA) !$OMP PARALLEL DO PRIVATE(N,XIJ,YIJ,IJX,IJY,XF,YF,J,I,WX,WY) SCHEDULE(STATIC) DO N=1,NO RLONX(N)=RLON(N) RLATX(N)=RLAT(N) XIJ=XPTS(N) YIJ=YPTS(N) IF(XIJ.NE.FILL.AND.YIJ.NE.FILL) THEN IJX(1:4)=FLOOR(XIJ-1)+(/0,1,2,3/) IJY(1:4)=FLOOR(YIJ-1)+(/0,1,2,3/) XF=XIJ-IJX(2) YF=YIJ-IJY(2) DO J=1,4 DO I=1,4 NXY(I,J,N)=IJKGDS1(IJX(I),IJY(J),IJKGDSA) ENDDO ENDDO IF(MINVAL(NXY(1:4,1:4,N)).GT.0) THEN ! BICUBIC WHERE 16-POINT STENCIL IS AVAILABLE NC(N)=1 WX(1)=XF*(1-XF)*(2-XF)/(-6.) WX(2)=(XF+1)*(1-XF)*(2-XF)/2. WX(3)=(XF+1)*XF*(2-XF)/2. WX(4)=(XF+1)*XF*(1-XF)/(-6.) WY(1)=YF*(1-YF)*(2-YF)/(-6.) WY(2)=(YF+1)*(1-YF)*(2-YF)/2. WY(3)=(YF+1)*YF*(2-YF)/2. WY(4)=(YF+1)*YF*(1-YF)/(-6.) ELSE ! BILINEAR ELSEWHERE NEAR THE EDGE OF THE GRID NC(N)=2 WX(1)=0 WX(2)=(1-XF) WX(3)=XF WX(4)=0 WY(1)=0 WY(2)=(1-YF) WY(3)=YF WY(4)=0 ENDIF DO J=1,4 DO I=1,4 WXY(I,J,N)=WX(I)*WY(J) ENDDO ENDDO ELSE NC(N)=0 ENDIF ENDDO ENDIF ENDIF ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! INTERPOLATE OVER ALL FIELDS IF(IRET.EQ.0.AND.IRETX.EQ.0) THEN IF(IGDTNUMO.GE.0) THEN NO=NOX DO N=1,NO RLON(N)=RLONX(N) RLAT(N)=RLATX(N) ENDDO ENDIF !$OMP PARALLEL DO PRIVATE(NK,K,N,G,W,GMIN,GMAX,J,I) SCHEDULE(STATIC) DO NK=1,NO*KM K=(NK-1)/NO+1 N=NK-NO*(K-1) IF(NC(N).GT.0) THEN G=0 W=0 IF(MCON.GT.0) GMIN=HUGE(GMIN) IF(MCON.GT.0) GMAX=-HUGE(GMAX) DO J=NC(N),5-NC(N) DO I=NC(N),5-NC(N) IF(NXY(I,J,N).GT.0)THEN IF(IBI(K).EQ.0.OR.LI(NXY(I,J,N),K))THEN G=G+WXY(I,J,N)*GI(NXY(I,J,N),K) W=W+WXY(I,J,N) IF(MCON.GT.0) GMIN=MIN(GMIN,GI(NXY(I,J,N),K)) IF(MCON.GT.0) GMAX=MAX(GMAX,GI(NXY(I,J,N),K)) ENDIF ENDIF ENDDO ENDDO LO(N,K)=W.GE.PMP IF(LO(N,K)) THEN GO(N,K)=G/W IF(MCON.GT.0) GO(N,K)=MIN(MAX(GO(N,K),GMIN),GMAX) ELSE GO(N,K)=0. ENDIF ELSE LO(N,K)=.FALSE. GO(N,K)=0. ENDIF ENDDO DO K=1,KM IBO(K)=IBI(K) IF(.NOT.ALL(LO(1:NO,K))) IBO(K)=1 ENDDO IF(IGDTNUMO.EQ.0) CALL POLFIXS(NO,MO,KM,RLAT,IBO,LO,GO) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ELSE IF(IRET.EQ.0) IRET=IRETX IF(IGDTNUMO.GE.0) NO=0 ENDIF ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END SUBROUTINE POLATES1 ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - SUBROUTINE CHECK_GRIDS1(IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & SAME_GRIDI, SAME_GRIDO) !$$$ SUBPROGRAM DOCUMENTATION BLOCK ! ! SUBPROGRAM: CHECK_GRIDS1 CHECK GRID INFORMATION ! PRGMMR: GAYNO ORG: W/NMC23 DATE: 2015-07-13 ! ! ABSTRACT: DETERMINE WHETHER THE INPUT OR OUTPUT GRID SPECS ! HAVE CHANGED. ! ! PROGRAM HISTORY LOG: ! 2015-07-13 GAYNO INITIAL VERSION ! ! USAGE: CALL CHECK_GRIDS1(IGDTNUMI,IGDTMPLI,IGDTLENI,IGDTNUMO,IGDTMPLO, & ! IGDTLENO, SAME_GRIDI, SAME_GRIDO) ! INPUT ARGUMENT LIST: ! IGDTNUMI - INTEGER GRID DEFINITION TEMPLATE NUMBER - INPUT GRID. ! CORRESPONDS TO THE GFLD%IGDTNUM COMPONENT OF THE ! NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! IGDTMPLI - INTEGER (IGDTLENI) GRID DEFINITION TEMPLATE ARRAY - ! INPUT GRID. CORRESPONDS TO THE GFLD%IGDTMPL COMPONENT ! OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! IGDTLENI - INTEGER NUMBER OF ELEMENTS OF THE GRID DEFINITION ! TEMPLATE ARRAY - INPUT GRID. CORRESPONDS TO THE GFLD%IGDTLEN ! COMPONENT OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! IGDTNUMO - INTEGER GRID DEFINITION TEMPLATE NUMBER - OUTPUT GRID. ! CORRESPONDS TO THE GFLD%IGDTNUM COMPONENT OF THE ! NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! IGDTMPLO - INTEGER (IGDTLENO) GRID DEFINITION TEMPLATE ARRAY - ! OUTPUT GRID. CORRESPONDS TO THE GFLD%IGDTMPL COMPONENT ! OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! IGDTLENO - INTEGER NUMBER OF ELEMENTS OF THE GRID DEFINITION ! TEMPLATE ARRAY - OUTPUT GRID. CORRESPONDS TO THE GFLD%IGDTLEN ! COMPONENT OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! ! OUTPUT ARGUMENT LIST: ! SAME_GRIDI - WHEN TRUE, THE INPUT GRID HAS NOT CHANGED BETWEEN CALLS. ! SAME_GRIDO - WHEN TRUE, THE OUTPUT GRID HAS NOT CHANGED BETWEEN CALLS. ! ! ATTRIBUTES: ! LANGUAGE: FORTRAN 90 ! !$$$ IMPLICIT NONE ! INTEGER, INTENT(IN ) :: IGDTNUMI, IGDTLENI INTEGER, INTENT(IN ) :: IGDTMPLI(IGDTLENI) INTEGER, INTENT(IN ) :: IGDTNUMO, IGDTLENO INTEGER, INTENT(IN ) :: IGDTMPLO(IGDTLENO) ! INTEGER, SAVE :: IGDTNUMI_SAVE=-9999 INTEGER, SAVE :: IGDTLENI_SAVE=-9999 INTEGER, SAVE :: IGDTMPLI_SAVE(1000)=-9999 INTEGER, SAVE :: IGDTNUMO_SAVE=-9999 INTEGER, SAVE :: IGDTLENO_SAVE=-9999 INTEGER, SAVE :: IGDTMPLO_SAVE(1000)=-9999 ! LOGICAL, INTENT( OUT) :: SAME_GRIDI, SAME_GRIDO ! ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - SAME_GRIDI=.FALSE. IF(IGDTNUMI==IGDTNUMI_SAVE)THEN IF(IGDTLENI==IGDTLENI_SAVE)THEN IF(ALL(IGDTMPLI==IGDTMPLI_SAVE(1:IGDTLENI)))THEN SAME_GRIDI=.TRUE. ENDIF ENDIF ENDIF ! IGDTNUMI_SAVE=IGDTNUMI IGDTLENI_SAVE=IGDTLENI IGDTMPLI_SAVE(1:IGDTLENI)=IGDTMPLI IGDTMPLI_SAVE(IGDTLENI+1:1000)=-9999 ! SAME_GRIDO=.FALSE. IF(IGDTNUMO==IGDTNUMO_SAVE)THEN IF(IGDTLENO==IGDTLENO_SAVE)THEN IF(ALL(IGDTMPLO==IGDTMPLO_SAVE(1:IGDTLENO)))THEN SAME_GRIDO=.TRUE. ENDIF ENDIF ENDIF ! IGDTNUMO_SAVE=IGDTNUMO IGDTLENO_SAVE=IGDTLENO IGDTMPLO_SAVE(1:IGDTLENO)=IGDTMPLO IGDTMPLO_SAVE(IGDTLENO+1:1000)=-9999 ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END SUBROUTINE CHECK_GRIDS1