C----------------------------------------------------------------------- SUBROUTINE GETGB2(LUGB,LUGI,J,JDISC,JIDS,JPDTN,JPDT,JGDTN,JGDT, & UNPACK,K,GFLD,IRET) C$$$ SUBPROGRAM DOCUMENTATION BLOCK C C SUBPROGRAM: GETGB2 FINDS AND UNPACKS A GRIB MESSAGE C PRGMMR: IREDELL ORG: W/NMC23 DATE: 94-04-01 C C ABSTRACT: FIND AND UNPACK A GRIB MESSAGE. C READ A GRIB INDEX FILE (OR OPTIONALLY THE GRIB FILE ITSELF) C TO GET THE INDEX BUFFER (I.E. TABLE OF CONTENTS) FOR THE GRIB FILE. C FIND IN THE INDEX BUFFER A REFERENCE TO THE GRIB FIELD REQUESTED. C THE GRIB FIELD REQUEST SPECIFIES THE NUMBER OF FIELDS TO SKIP C AND THE UNPACKED IDENTIFICATION SECTION, GRID DEFINITION TEMPLATE AND C PRODUCT DEFINTION SECTION PARAMETERS. (A REQUESTED PARAMETER C OF -9999 MEANS TO ALLOW ANY VALUE OF THIS PARAMETER TO BE FOUND.) C IF THE REQUESTED GRIB FIELD IS FOUND, THEN IT IS READ FROM THE C GRIB FILE AND UNPACKED. ITS NUMBER IS RETURNED ALONG WITH C THE ASSOCIATED UNPACKED PARAMETERS. THE BITMAP (IF ANY), C AND THE DATA VALUES ARE UNPACKED ONLY IF ARGUMENT "UNPACK" IS SET TO C TRUE. IF THE GRIB FIELD IS NOT FOUND, THEN THE C RETURN CODE WILL BE NONZERO. C C The decoded information for the selected GRIB field C is returned in a derived type variable, gfld. C Gfld is of type gribfield, which is defined C in module grib_mod, so users of this routine will need to include C the line "USE GRIB_MOD" in their calling routine. Each component of the C gribfield type is described in the OUTPUT ARGUMENT LIST section below. C C PROGRAM HISTORY LOG: C 94-04-01 IREDELL C 95-10-31 IREDELL MODULARIZED PORTIONS OF CODE INTO SUBPROGRAMS C AND ALLOWED FOR UNSPECIFIED INDEX FILE C 2002-01-11 GILBERT MODIFIED FROM GETGB AND GETGBM TO WORK WITH GRIB2 C C USAGE: CALL GETGB2(LUGB,LUGI,J,JDISC,JIDS,JPDTN,JPDT,JGDTN,JGDT, C & UNPACK,K,GFLD,IRET) C INPUT ARGUMENTS: C LUGB INTEGER UNIT OF THE UNBLOCKED GRIB DATA FILE. C FILE MUST BE OPENED WITH BAOPEN OR BAOPENR BEFORE CALLING C THIS ROUTINE. C LUGI INTEGER UNIT OF THE UNBLOCKED GRIB INDEX FILE. C IF NONZERO, FILE MUST BE OPENED WITH BAOPEN BAOPENR BEFORE C CALLING THIS ROUTINE. C >0 - READ INDEX FROM INDEX FILE LUGI, IF INDEX DOESN"T C ALREADY EXIST. C =0 - TO GET INDEX BUFFER FROM THE GRIB FILE, IF INDEX C DOESN"T ALREADY EXIST. C <0 - FORCE REREAD OF INDEX FROM INDEX FILE ABS(LUGI). C =LUGB - FORCE REGENERATION OF INDEX FROM GRIB2 FILE LUGB. C J INTEGER NUMBER OF FIELDS TO SKIP C (=0 TO SEARCH FROM BEGINNING) C JDISC GRIB2 DISCIPLINE NUMBER OF REQUESTED FIELD C ( IF = -1, ACCEPT ANY DISCIPLINE) C ( SEE CODE TABLE 0.0 ) C 0 - Meteorological products C 1 - Hydrological products C 2 - Land surface products C 3 - Space products C 10 - Oceanographic products C JIDS() INTEGER ARRAY OF VALUES IN THE IDENTIFICATION SECTION C (=-9999 FOR WILDCARD) C JIDS(1) = IDENTIFICATION OF ORIGINATING CENTRE C ( SEE COMMON CODE TABLE C-1 ) C JIDS(2) = IDENTIFICATION OF ORIGINATING SUB-CENTRE C JIDS(3) = GRIB MASTER TABLES VERSION NUMBER C ( SEE CODE TABLE 1.0 ) C 0 - Experimental C 1 - Initial operational version number C JIDS(4) = GRIB LOCAL TABLES VERSION NUMBER C ( SEE CODE TABLE 1.1 ) C 0 - Local tables not used C 1-254 - Number of local tables version used C JIDS(5) = SIGNIFICANCE OF REFERENCE TIME (CODE TABLE 1.2) C 0 - Analysis C 1 - Start of forecast C 2 - Verifying time of forecast C 3 - Observation time C JIDS(6) = YEAR ( 4 DIGITS ) C JIDS(7) = MONTH C JIDS(8) = DAY C JIDS(9) = HOUR C JIDS(10) = MINUTE C JIDS(11) = SECOND C JIDS(12) = PRODUCTION STATUS OF PROCESSED DATA C ( SEE CODE TABLE 1.3 ) C 0 - Operational products C 1 - Operational test products C 2 - Research products C 3 - Re-analysis products C JIDS(13) = TYPE OF PROCESSED DATA ( SEE CODE TABLE 1.4 ) C 0 - Analysis products C 1 - Forecast products C 2 - Analysis and forecast products C 3 - Control forecast products C 4 - Perturbed forecast products C 5 - Control and perturbed forecast products C 6 - Processed satellite observations C 7 - Processed radar observations C JPDTN INTEGER PRODUCT DEFINITION TEMPLATE NUMBER (N) C ( IF = -1, DON'T BOTHER MATCHING PDT - ACCEPT ANY ) C JPDT() INTEGER ARRAY OF VALUES DEFINING THE PRODUCT DEFINITION C TEMPLATE 4.N OF THE FIELD FOR WHICH TO SEARCH C (=-9999 FOR WILDCARD) C JGDTN INTEGER GRID DEFINITION TEMPLATE NUMBER (M) C ( IF = -1, DON'T BOTHER MATCHING GDT - ACCEPT ANY ) C JGDT() INTEGER ARRAY OF VALUES DEFINING THE GRID DEFINITION C TEMPLATE 3.M OF THE FIELD FOR WHICH TO SEARCH C (=-9999 FOR WILDCARD) C UNPACK LOGICAL VALUE INDICATING WHETHER TO UNPACK BITMAP/DATA C .TRUE. = UNPACK BITMAP AND DATA VALUES C .FALSE. = DO NOT UNPACK BITMAP AND DATA VALUES C C OUTPUT ARGUMENTS: C K INTEGER FIELD NUMBER UNPACKED C gfld - derived type gribfield ( defined in module grib_mod ) C ( NOTE: See Remarks Section ) C gfld%version = GRIB edition number ( currently 2 ) C gfld%discipline = Message Discipline ( see Code Table 0.0 ) C gfld%idsect() = Contains the entries in the Identification C Section ( Section 1 ) C This element is actually a pointer to an array C that holds the data. C gfld%idsect(1) = Identification of originating Centre C ( see Common Code Table C-1 ) C 7 - US National Weather Service C gfld%idsect(2) = Identification of originating Sub-centre C gfld%idsect(3) = GRIB Master Tables Version Number C ( see Code Table 1.0 ) C 0 - Experimental C 1 - Initial operational version number C gfld%idsect(4) = GRIB Local Tables Version Number C ( see Code Table 1.1 ) C 0 - Local tables not used C 1-254 - Number of local tables version used C gfld%idsect(5) = Significance of Reference Time (Code Table 1.2) C 0 - Analysis C 1 - Start of forecast C 2 - Verifying time of forecast C 3 - Observation time C gfld%idsect(6) = Year ( 4 digits ) C gfld%idsect(7) = Month C gfld%idsect(8) = Day C gfld%idsect(9) = Hour C gfld%idsect(10) = Minute C gfld%idsect(11) = Second C gfld%idsect(12) = Production status of processed data C ( see Code Table 1.3 ) C 0 - Operational products C 1 - Operational test products C 2 - Research products C 3 - Re-analysis products C gfld%idsect(13) = Type of processed data ( see Code Table 1.4 ) C 0 - Analysis products C 1 - Forecast products C 2 - Analysis and forecast products C 3 - Control forecast products C 4 - Perturbed forecast products C 5 - Control and perturbed forecast products C 6 - Processed satellite observations C 7 - Processed radar observations C gfld%idsectlen = Number of elements in gfld%idsect(). C gfld%local() = Pointer to character array containing contents C of Local Section 2, if included C gfld%locallen = length of array gfld%local() C gfld%ifldnum = field number within GRIB message C gfld%griddef = Source of grid definition (see Code Table 3.0) C 0 - Specified in Code table 3.1 C 1 - Predetermined grid Defined by originating centre C gfld%ngrdpts = Number of grid points in the defined grid. C gfld%numoct_opt = Number of octets needed for each C additional grid points definition. C Used to define number of C points in each row ( or column ) for C non-regular grids. C = 0, if using regular grid. C gfld%interp_opt = Interpretation of list for optional points C definition. (Code Table 3.11) C gfld%igdtnum = Grid Definition Template Number (Code Table 3.1) C gfld%igdtmpl() = Contains the data values for the specified Grid C Definition Template ( NN=gfld%igdtnum ). Each C element of this integer array contains an entry (in C the order specified) of Grid Defintion Template 3.NN C This element is actually a pointer to an array C that holds the data. C gfld%igdtlen = Number of elements in gfld%igdtmpl(). i.e. number of C entries in Grid Defintion Template 3.NN C ( NN=gfld%igdtnum ). C gfld%list_opt() = (Used if gfld%numoct_opt .ne. 0) This array C contains the number of grid points contained in C each row ( or column ). (part of Section 3) C This element is actually a pointer to an array C that holds the data. This pointer is nullified C if gfld%numoct_opt=0. C gfld%num_opt = (Used if gfld%numoct_opt .ne. 0) The number of entries C in array ideflist. i.e. number of rows ( or columns ) C for which optional grid points are defined. This value C is set to zero, if gfld%numoct_opt=0. C gfdl%ipdtnum = Product Definition Template Number (see Code Table 4.0) C gfld%ipdtmpl() = Contains the data values for the specified Product C Definition Template ( N=gfdl%ipdtnum ). Each element C of this integer array contains an entry (in the C order specified) of Product Defintion Template 4.N. C This element is actually a pointer to an array C that holds the data. C gfld%ipdtlen = Number of elements in gfld%ipdtmpl(). i.e. number of C entries in Product Defintion Template 4.N C ( N=gfdl%ipdtnum ). C gfld%coord_list() = Real array containing floating point values C intended to document the vertical discretisation C associated to model data on hybrid coordinate C vertical levels. (part of Section 4) C This element is actually a pointer to an array C that holds the data. C gfld%num_coord = number of values in array gfld%coord_list(). C gfld%ndpts = Number of data points unpacked and returned. C gfld%idrtnum = Data Representation Template Number C ( see Code Table 5.0) C gfld%idrtmpl() = Contains the data values for the specified Data C Representation Template ( N=gfld%idrtnum ). Each C element of this integer array contains an entry C (in the order specified) of Product Defintion C Template 5.N. C This element is actually a pointer to an array C that holds the data. C gfld%idrtlen = Number of elements in gfld%idrtmpl(). i.e. number C of entries in Data Representation Template 5.N C ( N=gfld%idrtnum ). C gfld%unpacked = logical value indicating whether the bitmap and C data values were unpacked. If false, C gfld%bmap and gfld%fld pointers are nullified. C gfld%expanded = Logical value indicating whether the data field C was expanded to the grid in the case where a C bit-map is present. If true, the data points in C gfld%fld match the grid points and zeros were C inserted at grid points where data was bit-mapped C out. If false, the data values in gfld%fld were C not expanded to the grid and are just a consecutive C array of data points corresponding to each value of C "1" in gfld%bmap. C gfld%ibmap = Bitmap indicator ( see Code Table 6.0 ) C 0 = bitmap applies and is included in Section 6. C 1-253 = Predefined bitmap applies C 254 = Previously defined bitmap applies to this field C 255 = Bit map does not apply to this product. C gfld%bmap() = Logical*1 array containing decoded bitmap, C if ibmap=0 or ibap=254. Otherwise nullified. C This element is actually a pointer to an array C that holds the data. C gfld%fld() = Array of gfld%ndpts unpacked data points. C This element is actually a pointer to an array C that holds the data. C IRET INTEGER RETURN CODE C 0 ALL OK C 96 ERROR READING INDEX C 97 ERROR READING GRIB FILE C 99 REQUEST NOT FOUND C OTHER GF_GETFLD GRIB2 UNPACKER RETURN CODE C C SUBPROGRAMS CALLED: C GETIDX GET INDEX C GETGB2S SEARCH INDEX RECORDS C GETGB2R READ AND UNPACK GRIB RECORD C GF_FREE FREES MEMORY USED BY GFLD ( SEE REMARKS ) C C REMARKS: SPECIFY AN INDEX FILE IF FEASIBLE TO INCREASE SPEED. C DO NOT ENGAGE THE SAME LOGICAL UNIT FROM MORE THAN ONE PROCESSOR. C C Note that derived type gribfield contains pointers to many C arrays of data. The memory for these arrays is allocated C when the values in the arrays are set, to help minimize C problems with array overloading. Because of this users C are encouraged to free up this memory, when it is no longer C needed, by an explicit call to subroutine gf_free. C ( i.e. CALL GF_FREE(GFLD) ) C C ATTRIBUTES: C LANGUAGE: FORTRAN 90 C C$$$ USE GRIB_MOD INTEGER,INTENT(IN) :: LUGB,LUGI,J,JDISC,JPDTN,JGDTN INTEGER,DIMENSION(:) :: JIDS(*),JPDT(*),JGDT(*) LOGICAL,INTENT(IN) :: UNPACK INTEGER,INTENT(OUT) :: K,IRET TYPE(GRIBFIELD),INTENT(OUT) :: GFLD CHARACTER(LEN=1),POINTER,DIMENSION(:) :: CBUF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C DECLARE INTERFACES (REQUIRED FOR CBUF POINTER) INTERFACE SUBROUTINE GETIDX(LUGB,LUGI,CBUF,NLEN,NNUM,IRGI) CHARACTER(LEN=1),POINTER,DIMENSION(:) :: CBUF INTEGER,INTENT(IN) :: LUGB,LUGI INTEGER,INTENT(OUT) :: NLEN,NNUM,IRGI END SUBROUTINE GETIDX END INTERFACE C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C DETERMINE WHETHER INDEX BUFFER NEEDS TO BE INITIALIZED IRGI=0 CALL GETIDX(LUGB,LUGI,CBUF,NLEN,NNUM,IRGI) IF(IRGI.GT.1) THEN IRET=96 RETURN ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C SEARCH INDEX BUFFER CALL GETGB2S(CBUF,NLEN,NNUM,J,JDISC,JIDS,JPDTN,JPDT,JGDTN,JGDT, & JK,GFLD,LPOS,IRGS) IF(IRGS.NE.0) THEN IRET=99 CALL GF_FREE(GFLD) RETURN ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C READ LOCAL USE SECTION, IF AVAILABLE CALL GETGB2L(LUGB,CBUF(LPOS),GFLD,IRET) C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C READ AND UNPACK GRIB RECORD IF (UNPACK) THEN ! NUMFLD=GFLD%IFLDNUM ! CALL GF_FREE(GFLD) CALL GETGB2R(LUGB,CBUF(LPOS),GFLD,IRET) ENDIF K=JK C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RETURN END