| 1 | C----------------------------------------------------------------------- |
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| 2 | SUBROUTINE GETGB2(LUGB,LUGI,J,GUESS,JDISC,JIDS,JPDTN,JPDT,JGDTN, |
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| 3 | & JGDT,UNPACK,K,GFLD,IRET) |
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| 4 | C$$$ SUBPROGRAM DOCUMENTATION BLOCK |
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| 5 | C |
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| 6 | C SUBPROGRAM: GETGB2 FINDS AND UNPACKS A GRIB MESSAGE |
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| 7 | C PRGMMR: IREDELL ORG: W/NMC23 DATE: 94-04-01 |
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| 8 | C |
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| 9 | C ABSTRACT: FIND AND UNPACK A GRIB MESSAGE. |
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| 10 | C READ A GRIB INDEX FILE (OR OPTIONALLY THE GRIB FILE ITSELF) |
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| 11 | C TO GET THE INDEX BUFFER (I.E. TABLE OF CONTENTS) FOR THE GRIB FILE. |
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| 12 | C FIND IN THE INDEX BUFFER A REFERENCE TO THE GRIB FIELD REQUESTED. |
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| 13 | C THE GRIB FIELD REQUEST SPECIFIES THE NUMBER OF FIELDS TO SKIP |
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| 14 | C AND THE UNPACKED IDENTIFICATION SECTION, GRID DEFINITION TEMPLATE AND |
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| 15 | C PRODUCT DEFINTION SECTION PARAMETERS. (A REQUESTED PARAMETER |
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| 16 | C OF -9999 MEANS TO ALLOW ANY VALUE OF THIS PARAMETER TO BE FOUND.) |
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| 17 | C IF THE REQUESTED GRIB FIELD IS FOUND, THEN IT IS READ FROM THE |
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| 18 | C GRIB FILE AND UNPACKED. ITS NUMBER IS RETURNED ALONG WITH |
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| 19 | C THE ASSOCIATED UNPACKED PARAMETERS. THE BITMAP (IF ANY), |
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| 20 | C AND THE DATA VALUES ARE UNPACKED ONLY IF ARGUMENT "UNPACK" IS SET TO |
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| 21 | C TRUE. IF THE GRIB FIELD IS NOT FOUND, THEN THE |
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| 22 | C RETURN CODE WILL BE NONZERO. |
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| 23 | C |
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| 24 | C The decoded information for the selected GRIB field |
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| 25 | C is returned in a derived type variable, gfld. |
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| 26 | C Gfld is of type gribfield, which is defined |
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| 27 | C in module grib_mod, so users of this routine will need to include |
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| 28 | C the line "USE GRIB_MOD" in their calling routine. Each component of the |
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| 29 | C gribfield type is described in the OUTPUT ARGUMENT LIST section below. |
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| 30 | C |
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| 31 | C PROGRAM HISTORY LOG: |
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| 32 | C 94-04-01 IREDELL |
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| 33 | C 95-10-31 IREDELL MODULARIZED PORTIONS OF CODE INTO SUBPROGRAMS |
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| 34 | C AND ALLOWED FOR UNSPECIFIED INDEX FILE |
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| 35 | C 2002-01-11 GILBERT MODIFIED FROM GETGB AND GETGBM TO WORK WITH GRIB2 |
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| 36 | C |
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| 37 | C USAGE: CALL GETGB2(LUGB,LUGI,J,JDISC,JIDS,JPDTN,JPDT,JGDTN,JGDT, |
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| 38 | C & UNPACK,K,GFLD,IRET) |
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| 39 | C INPUT ARGUMENTS: |
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| 40 | C LUGB INTEGER UNIT OF THE UNBLOCKED GRIB DATA FILE. |
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| 41 | C FILE MUST BE OPENED WITH BAOPEN OR BAOPENR BEFORE CALLING |
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| 42 | C THIS ROUTINE. |
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| 43 | C LUGI INTEGER UNIT OF THE UNBLOCKED GRIB INDEX FILE. |
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| 44 | C IF NONZERO, FILE MUST BE OPENED WITH BAOPEN BAOPENR BEFORE |
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| 45 | C CALLING THIS ROUTINE. |
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| 46 | C >0 - READ INDEX FROM INDEX FILE LUGI, IF INDEX DOESN"T |
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| 47 | C ALREADY EXIST. |
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| 48 | C =0 - TO GET INDEX BUFFER FROM THE GRIB FILE, IF INDEX |
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| 49 | C DOESN"T ALREADY EXIST. |
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| 50 | C <0 - FORCE REREAD OF INDEX FROM INDEX FILE ABS(LUGI). |
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| 51 | C =LUGB - FORCE REGENERATION OF INDEX FROM GRIB2 FILE LUGB. |
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| 52 | C J INTEGER NUMBER OF FIELDS TO SKIP |
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| 53 | C (=0 TO SEARCH FROM BEGINNING) |
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| 54 | C JDISC GRIB2 DISCIPLINE NUMBER OF REQUESTED FIELD |
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| 55 | C ( IF = -1, ACCEPT ANY DISCIPLINE) |
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| 56 | C ( SEE CODE TABLE 0.0 ) |
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| 57 | C 0 - Meteorological products |
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| 58 | C 1 - Hydrological products |
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| 59 | C 2 - Land surface products |
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| 60 | C 3 - Space products |
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| 61 | C 10 - Oceanographic products |
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| 62 | C JIDS() INTEGER ARRAY OF VALUES IN THE IDENTIFICATION SECTION |
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| 63 | C (=-9999 FOR WILDCARD) |
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| 64 | C JIDS(1) = IDENTIFICATION OF ORIGINATING CENTRE |
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| 65 | C ( SEE COMMON CODE TABLE C-1 ) |
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| 66 | C JIDS(2) = IDENTIFICATION OF ORIGINATING SUB-CENTRE |
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| 67 | C JIDS(3) = GRIB MASTER TABLES VERSION NUMBER |
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| 68 | C ( SEE CODE TABLE 1.0 ) |
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| 69 | C 0 - Experimental |
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| 70 | C 1 - Initial operational version number |
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| 71 | C JIDS(4) = GRIB LOCAL TABLES VERSION NUMBER |
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| 72 | C ( SEE CODE TABLE 1.1 ) |
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| 73 | C 0 - Local tables not used |
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| 74 | C 1-254 - Number of local tables version used |
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| 75 | C JIDS(5) = SIGNIFICANCE OF REFERENCE TIME (CODE TABLE 1.2) |
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| 76 | C 0 - Analysis |
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| 77 | C 1 - Start of forecast |
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| 78 | C 2 - Verifying time of forecast |
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| 79 | C 3 - Observation time |
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| 80 | C JIDS(6) = YEAR ( 4 DIGITS ) |
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| 81 | C JIDS(7) = MONTH |
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| 82 | C JIDS(8) = DAY |
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| 83 | C JIDS(9) = HOUR |
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| 84 | C JIDS(10) = MINUTE |
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| 85 | C JIDS(11) = SECOND |
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| 86 | C JIDS(12) = PRODUCTION STATUS OF PROCESSED DATA |
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| 87 | C ( SEE CODE TABLE 1.3 ) |
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| 88 | C 0 - Operational products |
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| 89 | C 1 - Operational test products |
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| 90 | C 2 - Research products |
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| 91 | C 3 - Re-analysis products |
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| 92 | C JIDS(13) = TYPE OF PROCESSED DATA ( SEE CODE TABLE 1.4 ) |
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| 93 | C 0 - Analysis products |
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| 94 | C 1 - Forecast products |
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| 95 | C 2 - Analysis and forecast products |
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| 96 | C 3 - Control forecast products |
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| 97 | C 4 - Perturbed forecast products |
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| 98 | C 5 - Control and perturbed forecast products |
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| 99 | C 6 - Processed satellite observations |
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| 100 | C 7 - Processed radar observations |
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| 101 | C JPDTN INTEGER PRODUCT DEFINITION TEMPLATE NUMBER (N) |
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| 102 | C ( IF = -1, DON'T BOTHER MATCHING PDT - ACCEPT ANY ) |
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| 103 | C JPDT() INTEGER ARRAY OF VALUES DEFINING THE PRODUCT DEFINITION |
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| 104 | C TEMPLATE 4.N OF THE FIELD FOR WHICH TO SEARCH |
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| 105 | C (=-9999 FOR WILDCARD) |
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| 106 | C JGDTN INTEGER GRID DEFINITION TEMPLATE NUMBER (M) |
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| 107 | C ( IF = -1, DON'T BOTHER MATCHING GDT - ACCEPT ANY ) |
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| 108 | C JGDT() INTEGER ARRAY OF VALUES DEFINING THE GRID DEFINITION |
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| 109 | C TEMPLATE 3.M OF THE FIELD FOR WHICH TO SEARCH |
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| 110 | C (=-9999 FOR WILDCARD) |
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| 111 | C UNPACK LOGICAL VALUE INDICATING WHETHER TO UNPACK BITMAP/DATA |
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| 112 | C .TRUE. = UNPACK BITMAP AND DATA VALUES |
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| 113 | C .FALSE. = DO NOT UNPACK BITMAP AND DATA VALUES |
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| 114 | C |
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| 115 | C OUTPUT ARGUMENTS: |
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| 116 | C K INTEGER FIELD NUMBER UNPACKED |
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| 117 | C gfld - derived type gribfield ( defined in module grib_mod ) |
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| 118 | C ( NOTE: See Remarks Section ) |
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| 119 | C gfld%version = GRIB edition number ( currently 2 ) |
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| 120 | C gfld%discipline = Message Discipline ( see Code Table 0.0 ) |
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| 121 | C gfld%idsect() = Contains the entries in the Identification |
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| 122 | C Section ( Section 1 ) |
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| 123 | C This element is actually a pointer to an array |
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| 124 | C that holds the data. |
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| 125 | C gfld%idsect(1) = Identification of originating Centre |
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| 126 | C ( see Common Code Table C-1 ) |
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| 127 | C 7 - US National Weather Service |
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| 128 | C gfld%idsect(2) = Identification of originating Sub-centre |
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| 129 | C gfld%idsect(3) = GRIB Master Tables Version Number |
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| 130 | C ( see Code Table 1.0 ) |
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| 131 | C 0 - Experimental |
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| 132 | C 1 - Initial operational version number |
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| 133 | C gfld%idsect(4) = GRIB Local Tables Version Number |
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| 134 | C ( see Code Table 1.1 ) |
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| 135 | C 0 - Local tables not used |
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| 136 | C 1-254 - Number of local tables version used |
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| 137 | C gfld%idsect(5) = Significance of Reference Time (Code Table 1.2) |
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| 138 | C 0 - Analysis |
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| 139 | C 1 - Start of forecast |
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| 140 | C 2 - Verifying time of forecast |
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| 141 | C 3 - Observation time |
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| 142 | C gfld%idsect(6) = Year ( 4 digits ) |
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| 143 | C gfld%idsect(7) = Month |
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| 144 | C gfld%idsect(8) = Day |
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| 145 | C gfld%idsect(9) = Hour |
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| 146 | C gfld%idsect(10) = Minute |
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| 147 | C gfld%idsect(11) = Second |
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| 148 | C gfld%idsect(12) = Production status of processed data |
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| 149 | C ( see Code Table 1.3 ) |
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| 150 | C 0 - Operational products |
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| 151 | C 1 - Operational test products |
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| 152 | C 2 - Research products |
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| 153 | C 3 - Re-analysis products |
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| 154 | C gfld%idsect(13) = Type of processed data ( see Code Table 1.4 ) |
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| 155 | C 0 - Analysis products |
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| 156 | C 1 - Forecast products |
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| 157 | C 2 - Analysis and forecast products |
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| 158 | C 3 - Control forecast products |
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| 159 | C 4 - Perturbed forecast products |
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| 160 | C 5 - Control and perturbed forecast products |
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| 161 | C 6 - Processed satellite observations |
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| 162 | C 7 - Processed radar observations |
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| 163 | C gfld%idsectlen = Number of elements in gfld%idsect(). |
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| 164 | C gfld%local() = Pointer to character array containing contents |
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| 165 | C of Local Section 2, if included |
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| 166 | C gfld%locallen = length of array gfld%local() |
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| 167 | C gfld%ifldnum = field number within GRIB message |
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| 168 | C gfld%griddef = Source of grid definition (see Code Table 3.0) |
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| 169 | C 0 - Specified in Code table 3.1 |
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| 170 | C 1 - Predetermined grid Defined by originating centre |
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| 171 | C gfld%ngrdpts = Number of grid points in the defined grid. |
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| 172 | C gfld%numoct_opt = Number of octets needed for each |
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| 173 | C additional grid points definition. |
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| 174 | C Used to define number of |
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| 175 | C points in each row ( or column ) for |
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| 176 | C non-regular grids. |
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| 177 | C = 0, if using regular grid. |
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| 178 | C gfld%interp_opt = Interpretation of list for optional points |
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| 179 | C definition. (Code Table 3.11) |
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| 180 | C gfld%igdtnum = Grid Definition Template Number (Code Table 3.1) |
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| 181 | C gfld%igdtmpl() = Contains the data values for the specified Grid |
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| 182 | C Definition Template ( NN=gfld%igdtnum ). Each |
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| 183 | C element of this integer array contains an entry (in |
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| 184 | C the order specified) of Grid Defintion Template 3.NN |
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| 185 | C This element is actually a pointer to an array |
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| 186 | C that holds the data. |
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| 187 | C gfld%igdtlen = Number of elements in gfld%igdtmpl(). i.e. number of |
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| 188 | C entries in Grid Defintion Template 3.NN |
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| 189 | C ( NN=gfld%igdtnum ). |
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| 190 | C gfld%list_opt() = (Used if gfld%numoct_opt .ne. 0) This array |
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| 191 | C contains the number of grid points contained in |
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| 192 | C each row ( or column ). (part of Section 3) |
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| 193 | C This element is actually a pointer to an array |
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| 194 | C that holds the data. This pointer is nullified |
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| 195 | C if gfld%numoct_opt=0. |
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| 196 | C gfld%num_opt = (Used if gfld%numoct_opt .ne. 0) The number of entries |
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| 197 | C in array ideflist. i.e. number of rows ( or columns ) |
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| 198 | C for which optional grid points are defined. This value |
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| 199 | C is set to zero, if gfld%numoct_opt=0. |
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| 200 | C gfdl%ipdtnum = Product Definition Template Number (see Code Table 4.0) |
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| 201 | C gfld%ipdtmpl() = Contains the data values for the specified Product |
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| 202 | C Definition Template ( N=gfdl%ipdtnum ). Each element |
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| 203 | C of this integer array contains an entry (in the |
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| 204 | C order specified) of Product Defintion Template 4.N. |
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| 205 | C This element is actually a pointer to an array |
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| 206 | C that holds the data. |
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| 207 | C gfld%ipdtlen = Number of elements in gfld%ipdtmpl(). i.e. number of |
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| 208 | C entries in Product Defintion Template 4.N |
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| 209 | C ( N=gfdl%ipdtnum ). |
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| 210 | C gfld%coord_list() = Real array containing floating point values |
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| 211 | C intended to document the vertical discretisation |
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| 212 | C associated to model data on hybrid coordinate |
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| 213 | C vertical levels. (part of Section 4) |
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| 214 | C This element is actually a pointer to an array |
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| 215 | C that holds the data. |
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| 216 | C gfld%num_coord = number of values in array gfld%coord_list(). |
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| 217 | C gfld%ndpts = Number of data points unpacked and returned. |
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| 218 | C gfld%idrtnum = Data Representation Template Number |
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| 219 | C ( see Code Table 5.0) |
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| 220 | C gfld%idrtmpl() = Contains the data values for the specified Data |
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| 221 | C Representation Template ( N=gfld%idrtnum ). Each |
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| 222 | C element of this integer array contains an entry |
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| 223 | C (in the order specified) of Product Defintion |
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| 224 | C Template 5.N. |
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| 225 | C This element is actually a pointer to an array |
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| 226 | C that holds the data. |
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| 227 | C gfld%idrtlen = Number of elements in gfld%idrtmpl(). i.e. number |
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| 228 | C of entries in Data Representation Template 5.N |
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| 229 | C ( N=gfld%idrtnum ). |
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| 230 | C gfld%unpacked = logical value indicating whether the bitmap and |
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| 231 | C data values were unpacked. If false, |
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| 232 | C gfld%bmap and gfld%fld pointers are nullified. |
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| 233 | C gfld%expanded = Logical value indicating whether the data field |
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| 234 | C was expanded to the grid in the case where a |
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| 235 | C bit-map is present. If true, the data points in |
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| 236 | C gfld%fld match the grid points and zeros were |
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| 237 | C inserted at grid points where data was bit-mapped |
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| 238 | C out. If false, the data values in gfld%fld were |
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| 239 | C not expanded to the grid and are just a consecutive |
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| 240 | C array of data points corresponding to each value of |
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| 241 | C "1" in gfld%bmap. |
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| 242 | C gfld%ibmap = Bitmap indicator ( see Code Table 6.0 ) |
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| 243 | C 0 = bitmap applies and is included in Section 6. |
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| 244 | C 1-253 = Predefined bitmap applies |
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| 245 | C 254 = Previously defined bitmap applies to this field |
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| 246 | C 255 = Bit map does not apply to this product. |
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| 247 | C gfld%bmap() = Logical*1 array containing decoded bitmap, |
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| 248 | C if ibmap=0 or ibap=254. Otherwise nullified. |
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| 249 | C This element is actually a pointer to an array |
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| 250 | C that holds the data. |
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| 251 | C gfld%fld() = Array of gfld%ndpts unpacked data points. |
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| 252 | C This element is actually a pointer to an array |
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| 253 | C that holds the data. |
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| 254 | C IRET INTEGER RETURN CODE |
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| 255 | C 0 ALL OK |
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| 256 | C 96 ERROR READING INDEX |
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| 257 | C 97 ERROR READING GRIB FILE |
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| 258 | C 99 REQUEST NOT FOUND |
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| 259 | C OTHER GF_GETFLD GRIB2 UNPACKER RETURN CODE |
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| 260 | C |
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| 261 | C SUBPROGRAMS CALLED: |
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| 262 | C GETIDX GET INDEX |
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| 263 | C GETGB2S SEARCH INDEX RECORDS |
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| 264 | C GETGB2R READ AND UNPACK GRIB RECORD |
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| 265 | C GF_FREE FREES MEMORY USED BY GFLD ( SEE REMARKS ) |
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| 266 | C |
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| 267 | C REMARKS: SPECIFY AN INDEX FILE IF FEASIBLE TO INCREASE SPEED. |
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| 268 | C DO NOT ENGAGE THE SAME LOGICAL UNIT FROM MORE THAN ONE PROCESSOR. |
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| 269 | C |
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| 270 | C Note that derived type gribfield contains pointers to many |
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| 271 | C arrays of data. The memory for these arrays is allocated |
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| 272 | C when the values in the arrays are set, to help minimize |
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| 273 | C problems with array overloading. Because of this users |
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| 274 | C are encouraged to free up this memory, when it is no longer |
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| 275 | C needed, by an explicit call to subroutine gf_free. |
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| 276 | C ( i.e. CALL GF_FREE(GFLD) ) |
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| 277 | C |
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| 278 | C ATTRIBUTES: |
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| 279 | C LANGUAGE: FORTRAN 90 |
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| 280 | C |
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| 281 | C$$$ |
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| 282 | USE GRIB_MOD |
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| 283 | |
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| 284 | INTEGER,INTENT(IN) :: LUGB,LUGI,J,JDISC,JPDTN,JGDTN |
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| 285 | INTEGER,INTENT(IN) :: GUESS |
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| 286 | INTEGER,DIMENSION(:) :: JIDS(*),JPDT(*),JGDT(*) |
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| 287 | LOGICAL,INTENT(IN) :: UNPACK |
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| 288 | INTEGER,INTENT(OUT) :: K,IRET |
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| 289 | TYPE(GRIBFIELD),INTENT(OUT) :: GFLD |
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| 290 | |
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| 291 | CHARACTER(LEN=1),POINTER,DIMENSION(:) :: CBUF |
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| 292 | |
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| 293 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 294 | C DECLARE INTERFACES (REQUIRED FOR CBUF POINTER) |
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| 295 | INTERFACE |
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| 296 | SUBROUTINE GETIDX(LUGB,LUGI,CBUF,NLEN,NNUM,IRGI) |
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| 297 | CHARACTER(LEN=1),POINTER,DIMENSION(:) :: CBUF |
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| 298 | INTEGER,INTENT(IN) :: LUGB,LUGI |
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| 299 | INTEGER,INTENT(OUT) :: NLEN,NNUM,IRGI |
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| 300 | END SUBROUTINE GETIDX |
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| 301 | END INTERFACE |
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| 302 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 303 | C DETERMINE WHETHER INDEX BUFFER NEEDS TO BE INITIALIZED |
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| 304 | IRGI=0 |
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| 305 | CALL GETIDX(LUGB,LUGI,CBUF,NLEN,NNUM,IRGI) |
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| 306 | IF(IRGI.GT.1) THEN |
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| 307 | IRET=96 |
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| 308 | RETURN |
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| 309 | ENDIF |
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| 310 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 311 | C SEARCH INDEX BUFFER |
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| 312 | CALL GETGB2S(CBUF,NLEN,NNUM,J,GUESS,JDISC,JIDS,JPDTN,JPDT,JGDTN, |
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| 313 | & JGDT,JK,GFLD,LPOS,IRGS) |
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| 314 | IF(IRGS.NE.0) THEN |
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| 315 | IRET=99 |
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| 316 | CALL GF_FREE(GFLD) |
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| 317 | RETURN |
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| 318 | ENDIF |
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| 319 | |
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| 320 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 321 | C READ LOCAL USE SECTION, IF AVAILABLE |
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| 322 | CALL GETGB2L(LUGB,CBUF(LPOS),GFLD,IRET) |
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| 323 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 324 | C READ AND UNPACK GRIB RECORD |
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| 325 | IF (UNPACK) THEN |
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| 326 | ! NUMFLD=GFLD%IFLDNUM |
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| 327 | ! CALL GF_FREE(GFLD) |
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| 328 | CALL GETGB2R(LUGB,CBUF(LPOS),GFLD,IRET) |
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| 329 | ENDIF |
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| 330 | K=JK |
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| 331 | C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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| 332 | RETURN |
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| 333 | END |
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