C----------------------------------------------------------------------- SUBROUTINE GETGB2L(LUGB,CINDEX,GFLD,IRET) C$$$ SUBPROGRAM DOCUMENTATION BLOCK C C SUBPROGRAM: GETGB2L EXTRACTS LOCAL USE SECTION C PRGMMR: GILBERT ORG: W/NP11 DATE: 02-05-07 C C ABSTRACT: READ AND UNPACK A LOCAL USE SECTION FROM A GRIB2 MESSAGE. 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 2002-05-07 GILBERT C C USAGE: CALL GETGB2L(LUGB,CINDEX,GFLD,IRET) C INPUT ARGUMENTS: C LUGB INTEGER UNIT OF THE UNBLOCKED GRIB DATA FILE C CINDEX INDEX RECORD OF THE GRIB FIELD ( SEE DOCBLOCK OF C SUBROUTINE IXGB2 FOR DESCRIPTION OF AN INDEX RECORD.) C OUTPUT ARGUMENTS: 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%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 97 ERROR READING GRIB FILE C OTHER GF_GETFLD GRIB UNPACKER RETURN CODE C C SUBPROGRAMS CALLED: C BAREAD BYTE-ADDRESSABLE READ C GF_GETFLD UNPACK GRIB FIELD C C REMARKS: C DO NOT ENGAGE THE SAME LOGICAL UNIT FROM MORE THAN ONE PROCESSOR. C THIS SUBPROGRAM IS INTENDED FOR PRIVATE USE BY GETGB2 ROUTINES ONLY. 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 CHARACTER(LEN=1),INTENT(IN) :: CINDEX(*) INTEGER,INTENT(OUT) :: IRET TYPE(GRIBFIELD) :: GFLD INTEGER :: LSKIP,SKIP2 CHARACTER(LEN=1):: CSIZE(4) CHARACTER(LEN=1),ALLOCATABLE :: CTEMP(:) interface subroutine gf_unpack2(cgrib,lcgrib,iofst,lencsec2,csec2,ierr) character(len=1),intent(in) :: cgrib(lcgrib) integer,intent(in) :: lcgrib integer,intent(inout) :: iofst integer,intent(out) :: lencsec2 integer,intent(out) :: ierr character(len=1),pointer,dimension(:) :: csec2 end subroutine gf_unpack2 end interface C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C GET INFO NULLIFY(gfld%local) IRET=0 CALL GBYTE(CINDEX,LSKIP,4*8,4*8) CALL GBYTE(CINDEX,SKIP2,8*8,4*8) C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C READ AND UNPACK LOCAL USE SECTION, IF PRESENT IF ( SKIP2.NE.0 ) THEN ISKIP=LSKIP+SKIP2 CALL BAREAD(LUGB,ISKIP,4,LREAD,CSIZE) ! GET LENGTH OF SECTION CALL GBYTE(CSIZE,ILEN,0,32) ALLOCATE(CTEMP(ILEN)) CALL BAREAD(LUGB,ISKIP,ILEN,LREAD,CTEMP) ! READ IN SECTION IF (ILEN.NE.LREAD) THEN IRET=97 DEALLOCATE(CTEMP) RETURN ENDIF IOFST=0 CALL GF_UNPACK2(CTEMP,ILEN,IOFST,gfld%locallen, & gfld%local,ierr) IF (IERR.NE.0) THEN IRET=98 DEALLOCATE(CTEMP) RETURN ENDIF DEALLOCATE(CTEMP) ELSE gfld%locallen=0 ENDIF C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - RETURN END