#include "config.h" SUBROUTINE IPOLATEV(IP,IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,UI,VI, & NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) !$$$ SUBPROGRAM DOCUMENTATION BLOCK ! ! $Revision: 74685 $ ! ! SUBPROGRAM: IPOLATEV IREDELL'S POLATE FOR VECTOR FIELDS ! PRGMMR: IREDELL ORG: W/NMC23 DATE: 96-04-10 ! ! ABSTRACT: THIS SUBPROGRAM INTERPOLATES VECTOR FIELDS ! FROM ANY GRID TO ANY GRID (JOE IRWIN'S DREAM). ! ONLY HORIZONTAL INTERPOLATION IS PERFORMED. ! THE FOLLOWING INTERPOLATION METHODS ARE POSSIBLE: ! (IP=0) BILINEAR ! (IP=1) BICUBIC ! (IP=2) NEIGHBOR ! (IP=3) BUDGET ! (IP=4) SPECTRAL ! (IP=6) NEIGHBOR-BUDGET ! SOME OF THESE METHODS HAVE INTERPOLATION OPTIONS AND/OR ! RESTRICTIONS ON THE INPUT OR OUTPUT GRIDS, BOTH OF WHICH ! ARE DOCUMENTED MORE FULLY IN THEIR RESPECTIVE SUBPROGRAMS. ! ! THE INPUT AND OUTPUT GRIDS ARE DEFINED BY THEIR GRIB 2 GRID ! DEFINITION TEMPLATE AS DECODED BY THE NCEP G2 LIBRARY. 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 ! ! THE INPUT AND OUTPUT VECTORS ARE ROTATED SO THAT THEY ARE ! EITHER RESOLVED RELATIVE TO THE DEFINED GRID ! IN THE DIRECTION OF INCREASING X AND Y COORDINATES ! OR RESOLVED RELATIVE TO EASTERLY AND NORTHERLY DIRECTIONS, ! AS DESIGNATED BY THEIR RESPECTIVE GRID DEFINITION SECTIONS. ! ! AS AN ADDED BONUS THE NUMBER OF OUTPUT GRID POINTS ! AND THEIR LATITUDES AND LONGITUDES ARE ALSO RETURNED ! ALONG WITH THEIR VECTOR ROTATION PARAMETERS. ! ON THE OTHER HAND, THE DATA MAY BE INTERPOLATED TO A SET OF ! STATION POINTS IF IGDTNUMO<0 (IGDTNUMO-255 FOR THE BUDGET OPTION), ! IN WHICH CASE THE NUMBER OF POINTS AND THEIR LATITUDES AND ! LONGITUDES MUST BE INPUT ALONG WITH THEIR VECTOR ROTATION ! PARAMETERS. ! ! INPUT BITMAPS WILL BE INTERPOLATED TO OUTPUT BITMAPS. ! OUTPUT BITMAPS WILL ALSO 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 ! 2003-06-23 IREDELL STAGGERING FOR GRID TYPE 203 ! 2015-01-27 GAYNO REMOVE REFERENCES TO OBSOLETE NCEP GRIDS 201 ! AND 202. ! 2015-07-13 GAYNO CONVERT TO GRIB 2. REPLACE GRIB 1 KGDS ARRAYS ! WITH GRIB 2 GRID DEFINITION TEMPLATE ARRAYS. ! ! USAGE: CALL IPOLATEV(IP,IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & ! IGDTNUMO,IGDTMPLO,IGDTLENO, & ! MI,MO,KM,IBI,LI,UI,VI, & ! NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) ! ! INPUT ARGUMENT LIST: ! IP - INTEGER INTERPOLATION METHOD ! (IP=0 FOR BILINEAR; ! IP=1 FOR BICUBIC; ! IP=2 FOR NEIGHBOR; ! IP=3 FOR BUDGET; ! IP=4 FOR SPECTRAL; ! IP=6 FOR NEIGHBOR-BUDGET) ! IPOPT - INTEGER (20) INTERPOLATION OPTIONS ! (IP=0: MIN MASK % ! IP=1: CONSTRAINT OPTION, MIN MASK % ! IP=2: SEARCH RADIUS ! IP=3: NUMBER IN RADIUS, RADIUS WEIGHTS, MIN MASK % ! IP=4: SPECTRAL SHAPE, SPECTRAL TRUNCATION ! IP=6: NUMBER IN RADIUS, RADIUS WEIGHTS, MIN MASK % ! 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): ! ALL MAP PROJECTIONS: ! (1): SHAPE OF EARTH, OCTET 15 ! (2): SCALE FACTOR OF SPHERICAL EARTH RADIUS, ! OCTET 16 ! (3): SCALED VALUE OF RADIUS OF SPHERICAL EARTH, ! OCTETS 17-20 ! (4): SCALE FACTOR OF MAJOR AXIS OF ELLIPTICAL EARTH, ! OCTET 21 ! (5): SCALED VALUE OF MAJOR AXIS OF ELLIPTICAL EARTH, ! OCTETS 22-25 ! (6): SCALE FACTOR OF MINOR AXIS OF ELLIPTICAL EARTH, ! OCTET 26 ! (7): SCALED VALUE OF MINOR AXIS OF ELLIPTICAL EARTH, ! OCTETS 27-30 ! EQUIDISTANT CYCLINDRICAL: ! (8): NUMBER OF POINTS ALONG A PARALLEL, OCTS 31-34 ! (9): NUMBER OF POINTS ALONG A MERIDIAN, OCTS 35-38 ! (10): BASIC ANGLE OF INITIAL PRODUCTION DOMAIN, ! OCTETS 39-42. ! (11): SUBDIVISIONS OF BASIC ANGLE, OCTETS 43-46 ! (12): LATITUDE OF FIRST GRID POINT, OCTETS 47-50 ! (13): LONGITUDE OF FIRST GRID POINT, OCTETS 51-54 ! (14): RESOLUTION AND COMPONENT FLAGS, OCTET 55 ! (15): LATITUDE OF LAST GRID POINT, OCTETS 56-59 ! (16): LONGITUDE OF LAST GRID POINT, OCTETS 60-63 ! (17): I-DIRECTION INCREMENT, OCTETS 64-67 ! (18): J-DIRECTION INCREMENT, OCTETS 68-71 ! (19): SCANNING MODE, OCTET 72 ! MERCATOR CYCLINDRICAL: ! (8): NUMBER OF POINTS ALONG A PARALLEL, OCTS 31-34 ! (9): NUMBER OF POINTS ALONG A MERIDIAN, OCTS 35-38 ! (10): LATITUDE OF FIRST POINT, OCTETS 39-42 ! (11): LONGITUDE OF FIRST POINT, OCTETS 43-46 ! (12): RESOLUTION AND COMPONENT FLAGS, OCTET 47 ! (13): TANGENT LATITUDE, OCTETS 48-51 ! (14): LATITUDE OF LAST POINT, OCTETS 52-55 ! (15): LONGITUDE OF LAST POINT, OCTETS 56-59 ! (16): SCANNING MODE FLAGS, OCTET 60 ! (17): ORIENTATION OF GRID, OCTETS 61-64 ! (18): LONGITUDINAL GRID LENGTH, OCTETS 65-68 ! (19): LATITUDINAL GRID LENGTH, OCTETS 69-72 ! LAMBERT CONFORMAL CONICAL: ! (8): NUMBER OF POINTS ALONG X-AXIS, OCTS 31-34 ! (9): NUMBER OF POINTS ALONG Y-AXIS, OCTS 35-38 ! (10): LATITUDE OF FIRST POINT, OCTETS 39-42 ! (11): LONGITUDE OF FIRST POINT, OCTETS 43-46 ! (12): RESOLUTION OF COMPONENT FLAG, OCTET 47 ! (13): LATITUDE WHERE GRID LENGTHS SPECIFIED, ! OCTETS 48-51 ! (14): LONGITUDE OF MERIDIAN THAT IS PARALLEL TO ! Y-AXIS, OCTETS 52-55 ! (15): X-DIRECTION GRID LENGTH, OCTETS 56-59 ! (16): Y-DIRECTION GRID LENGTH, OCTETS 60-63 ! (17): PROJECTION CENTER FLAG, OCTET 64 ! (18): SCANNING MODE, OCTET 65 ! (19): FIRST TANGENT LATITUDE FROM POLE, OCTETS 66-69 ! (20): SECOND TANGENT LATITUDE FROM POLE, OCTETS 70-73 ! (21): LATITUDE OF SOUTH POLE OF PROJECTION, ! OCTETS 74-77 ! (22): LONGITUDE OF SOUTH POLE OF PROJECTION, ! OCTETS 78-81 ! GAUSSIAN CYLINDRICAL: ! (8): NUMBER OF POINTS ALONG A PARALLEL, OCTS 31-34 ! (9): NUMBER OF POINTS ALONG A MERIDIAN, OCTS 35-38 ! (10): BASIC ANGLE OF INITIAL PRODUCTION DOMAIN, ! OCTETS 39-42 ! (11): SUBDIVISIONS OF BASIC ANGLE, OCTETS 43-46 ! (12): LATITUDE OF FIRST GRID POINT, OCTETS 47-50 ! (13): LONGITUDE OF FIRST GRID POINT, OCTETS 51-54 ! (14): RESOLUTION AND COMPONENT FLAGS, OCTET 55 ! (15): LATITUDE OF LAST GRID POINT, OCTETS 56-59 ! (16): LONGITUDE OF LAST GRID POINT, OCTETS 60-63 ! (17): I-DIRECTION INCREMENT, OCTETS 64-67 ! (18): NUMBER OF PARALLELS BETWEEN POLE AND EQUATOR, ! OCTETS 68-71 ! (19): SCANNING MODE, OCTET 72 ! POLAR STEREOGRAPHIC AZIMUTHAL: ! (8): NUMBER OF POINTS ALONG X-AXIS, OCTETS 31-34 ! (9): NUMBER OF POINTS ALONG Y-AXIS, OCTETS 35-38 ! (10): LATITUDE OF FIRST GRID POINT, OCTETS 39-42 ! (11): LONGITUDE OF FIRST GRID POINT, OCTETS 43-46 ! (12): RESOLUTION AND COMPONENT FLAGS, OCTET 47 ! (13): TRUE LATITUDE, OCTETS 48-51 ! (14): ORIENTATION LONGITUDE, OCTETS 52-55 ! (15): X-DIRECTION GRID LENGTH, OCTETS 56-59 ! (16): Y-DIRECTION GRID LENGTH, OCTETS 60-63 ! (17): PROJECTION CENTER FLAG, OCTET 64 ! (18): SCANNING MODE FLAGS, OCTET 65 ! ROTATED EQUIDISTANT CYCLINDRICAL: ! (8): NUMBER OF POINTS ALONG A PARALLEL, OCTS 31-34 ! (9): NUMBER OF POINTS ALONG A MERIDIAN, OCTS 35-38 ! (10): BASIC ANGLE OF INITIAL PRODUCTION DOMAIN, ! OCTETS 39-42 ! (11): SUBDIVISIONS OF BASIC ANGLE, OCTETS 43-46 ! (12): LATITUDE OF FIRST GRID POINT, OCTETS 47-50 ! (13): LONGITUDE OF FIRST GRID POINT, OCTETS 51-54 ! (14): RESOLUTION AND COMPONENT FLAGS, OCTET 55 ! (15): LATITUDE OF LAST GRID POINT, OCTETS 56-59 ! (16): LONGITUDE OF LAST GRID POINT, OCTETS 60-63 ! (17): I-DIRECTION INCREMENT, OCTETS 64-67 ! (18): J-DIRECTION INCREMENT, OCTETS 68-71 ! (19): SCANNING MODE, OCTET 72 ! (20): LATITUDE OF SOUTHERN POLE OF PROJECTION, ! OCTETS 73-76 ! (21): LONGITUDE OF SOUTHERN POLE OF PROJECTION, ! OCTETS 77-80 ! (22): ANGLE OF ROTATION OF PROJECTION, OCTS 81-84 ! 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. SEE "IGDTNUMI" ! FOR SPECIFIC TEMPLATE DEFINITIONS. NOTE: IGDTNUMO<0 ! MEANS INTERPOLATE TO RANDOM STATION POINTS. ! IGDTMPLO - INTEGER (IGDTLENO) GRID DEFINITION TEMPLATE ARRAY - ! OUTPUT GRID. CORRESPONDS TO THE GFLD%IGDTMPL COMPONENT ! OF THE NCEP G2 LIBRARY GRIDMOD DATA STRUCTURE. ! SEE "IGDTMPLI" FOR DEFINITION OF ARRAY ELEMENTS. ! 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 RESPECTIVE IBI(K)=1) ! UI - REAL (MI,KM) INPUT U-COMPONENT FIELDS TO INTERPOLATE ! VI - REAL (MI,KM) INPUT V-COMPONENT FIELDS TO INTERPOLATE ! RLAT - REAL (MO) OUTPUT LATITUDES IN DEGREES (IF IGDTNUMO<0) ! RLON - REAL (MO) OUTPUT LONGITUDES IN DEGREES (IF IGDTNUMO<0) ! CROT - REAL (MO) VECTOR ROTATION COSINES (IF IGDTNUMO<0) ! SROT - REAL (MO) VECTOR ROTATION SINES (IF IGDTNUMO<0) ! (UGRID=CROT*UEARTH-SROT*VEARTH; ! VGRID=SROT*UEARTH+CROT*VEARTH) ! ! 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) ! CROT - REAL (MO) VECTOR ROTATION COSINES (IF IGDTNUMO>=0) ! SROT - REAL (MO) VECTOR ROTATION SINES (IF IGDTNUMO>=0) ! (UGRID=CROT*UEARTH-SROT*VEARTH; ! VGRID=SROT*UEARTH+CROT*VEARTH) ! IBO - INTEGER (KM) OUTPUT BITMAP FLAGS ! LO - LOGICAL*1 (MO,KM) OUTPUT BITMAPS (ALWAYS OUTPUT) ! UO - REAL (MO,KM) OUTPUT U-COMPONENT FIELDS INTERPOLATED ! VO - REAL (MO,KM) OUTPUT V-COMPONENT FIELDS INTERPOLATED ! IRET - INTEGER RETURN CODE ! 0 SUCCESSFUL INTERPOLATION ! 1 UNRECOGNIZED INTERPOLATION METHOD ! 2 UNRECOGNIZED INPUT GRID OR NO GRID OVERLAP ! 3 UNRECOGNIZED OUTPUT GRID ! 1X INVALID BICUBIC METHOD PARAMETERS ! 3X INVALID BUDGET METHOD PARAMETERS ! 4X INVALID SPECTRAL METHOD PARAMETERS ! ! SUBPROGRAMS CALLED: ! POLATEV0 INTERPOLATE VECTOR FIELDS (BILINEAR) ! POLATEV1 INTERPOLATE VECTOR FIELDS (BICUBIC) ! POLATEV2 INTERPOLATE VECTOR FIELDS (NEIGHBOR) ! POLATEV3 INTERPOLATE VECTOR FIELDS (BUDGET) ! POLATEV4 INTERPOLATE VECTOR FIELDS (SPECTRAL) ! POLATEV6 INTERPOLATE VECTOR FIELDS (NEIGHBOR-BUDGET) ! ! REMARKS: EXAMPLES DEMONSTRATING RELATIVE CPU COSTS. ! THIS EXAMPLE IS INTERPOLATING 12 LEVELS OF WINDS ! FROM THE 360 X 181 GLOBAL GRID (NCEP GRID 3) ! TO THE 93 X 68 HAWAIIAN MERCATOR GRID (NCEP GRID 204). ! THE EXAMPLE TIMES ARE FOR THE C90. AS A REFERENCE, THE CP TIME ! FOR UNPACKING THE GLOBAL 12 PAIRS OF WIND FIELDS IS 0.07 SECONDS. ! ! BILINEAR 0 0.05 ! BICUBIC 1 0 0.16 ! BICUBIC 1 1 0.17 ! NEIGHBOR 2 0.02 ! BUDGET 3 -1,-1 0.94 ! SPECTRAL 4 0,40 0.31 ! SPECTRAL 4 1,40 0.33 ! SPECTRAL 4 0,-1 0.59 ! N-BUDGET 6 0,-1 0.31 ! ! THE SPECTRAL INTERPOLATION IS FAST FOR THE MERCATOR GRID. ! HOWEVER, FOR SOME GRIDS THE SPECTRAL INTERPOLATION IS SLOW. ! THE FOLLOWING EXAMPLE IS INTERPOLATING 12 LEVELS OF WINDS ! FROM THE 360 X 181 GLOBAL GRID (NCEP GRID 3) ! TO THE 93 X 65 CONUS LAMBERT CONFORMAL GRID (NCEP GRID 211). ! ! METHOD IP IPOPT CP SECONDS ! -------- -- ------------- ---------- ! BILINEAR 0 0.05 ! BICUBIC 1 0 0.15 ! BICUBIC 1 1 0.16 ! NEIGHBOR 2 0.02 ! BUDGET 3 -1,-1 0.92 ! SPECTRAL 4 0,40 4.51 ! SPECTRAL 4 1,40 5.77 ! SPECTRAL 4 0,-1 12.60 ! N-BUDGET 6 0,-1 0.33 ! ! ATTRIBUTES: ! LANGUAGE: FORTRAN 90 ! !$$$ IMPLICIT NONE ! INTEGER, INTENT(IN ) :: IP, IPOPT(20), IBI(KM) INTEGER, INTENT(IN ) :: KM, MI, MO INTEGER, INTENT(IN ) :: IGDTNUMI, IGDTLENI INTEGER, INTENT(IN ) :: IGDTMPLI(IGDTLENI) INTEGER, INTENT(IN ) :: IGDTNUMO, IGDTLENO INTEGER, INTENT(IN ) :: IGDTMPLO(IGDTLENO) INTEGER, INTENT( OUT) :: IBO(KM), IRET, NO ! LOGICAL*1, INTENT(IN ) :: LI(MI,KM) LOGICAL*1, INTENT( OUT) :: LO(MO,KM) ! REAL, INTENT(IN ) :: UI(MI,KM),VI(MI,KM) REAL, INTENT(INOUT) :: CROT(MO),SROT(MO) REAL, INTENT(INOUT) :: RLAT(MO),RLON(MO) REAL, INTENT( OUT) :: UO(MO,KM),VO(MO,KM) ! INTEGER :: K, N ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! BILINEAR INTERPOLATION IF(IP.EQ.0) THEN CALL POLATEV0(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,UI,VI,& NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! BICUBIC INTERPOLATION ELSEIF(IP.EQ.1) THEN CALL POLATEV1(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,UI,VI,& NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! NEIGHBOR INTERPOLATION ELSEIF(IP.EQ.2) THEN CALL POLATEV2(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,UI,VI,& NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! BUDGET INTERPOLATION ELSEIF(IP.EQ.3) THEN CALL POLATEV3(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,UI,VI,& NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! SPECTRAL INTERPOLATION ! WNE #if USE_SPECTRAL == 1 ELSEIF(IP.EQ.4) THEN CALL POLATEV4(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,UI,VI,& NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) #endif ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! NEIGHBOR-BUDGET INTERPOLATION ELSEIF(IP.EQ.6) THEN CALL POLATEV6(IPOPT,IGDTNUMI,IGDTMPLI,IGDTLENI, & IGDTNUMO,IGDTMPLO,IGDTLENO, & MI,MO,KM,IBI,LI,UI,VI,& NO,RLAT,RLON,CROT,SROT,IBO,LO,UO,VO,IRET) ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! UNRECOGNIZED INTERPOLATION METHOD ELSE IF(IGDTNUMO.GE.0) NO=0 DO K=1,KM IBO(K)=1 DO N=1,NO LO(N,K)=.FALSE. UO(N,K)=0. VO(N,K)=0. ENDDO ENDDO IRET=1 ENDIF ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END SUBROUTINE IPOLATEV