ungrib/src/ngl/w3/getgbmp.f

   1 C-----------------------------------------------------------------------
   2       SUBROUTINE GETGBMP(LUGB,LUGI,JG,J,JPDS,JGDS,
   3      &                   MBUF,CBUF,NLEN,NNUM,MNUM,
   4      &                   KG,K,KPDS,KGDS,G,IRET)
   5 C$$$  SUBPROGRAM DOCUMENTATION BLOCK
   6 C
   7 C SUBPROGRAM: GETGBMP        FINDS A GRIB MESSAGE
   8 C   PRGMMR: IREDELL          ORG: W/NMC23     DATE: 94-04-01
   9 C
  10 C ABSTRACT: FIND A GRIB MESSAGE.
  11 C   READ A GRIB INDEX FILE (OR OPTIONALLY THE GRIB FILE ITSELF)
  12 C   TO GET THE INDEX BUFFER (I.E. TABLE OF CONTENTS) FOR THE GRIB FILE.
  13 C   FIND IN THE INDEX BUFFER A REFERENCE TO THE GRIB MESSAGE REQUESTED.
  14 C   THE GRIB MESSAGE REQUEST SPECIFIES THE NUMBER OF MESSAGES TO SKIP
  15 C   AND THE UNPACKED PDS AND GDS PARAMETERS.  (A REQUESTED PARAMETER
  16 C   OF -1 MEANS TO ALLOW ANY VALUE OF THIS PARAMETER TO BE FOUND.)
  17 C   IF THE REQUESTED GRIB MESSAGE IS FOUND, THEN IT IS READ FROM THE
  18 C   GRIB FILE.  ITS MESSAGE NUMBER IS RETURNED ALONG WITH THE UNPACKED
  19 C   PDS AND GDS PARAMETERS AND THE PACKED GRIB MESSAGE.  IF THE GRIB
  20 C   MESSAGE IS NOT FOUND, THEN THE RETURN CODE WILL BE NONZERO.
  21 C
  22 C PROGRAM HISTORY LOG:
  23 C   94-04-01  IREDELL
  24 C   95-10-31  IREDELL     MODULARIZED PORTIONS OF CODE INTO SUBPROGRAMS
  25 C                         AND ALLOWED FOR UNSPECIFIED INDEX FILE
  26 C
  27 C USAGE:    CALL GETGBMP(LUGB,LUGI,JG,J,JPDS,JGDS,
  28 C    &                   MBUF,CBUF,NLEN,NNUM,MNUM,
  29 C    &                   KG,K,KPDS,KGDS,G,IRET)
  30 C   INPUT ARGUMENTS:
  31 C     LUGB         INTEGER UNIT OF THE UNBLOCKED GRIB DATA FILE
  32 C     LUGI         INTEGER UNIT OF THE UNBLOCKED GRIB INDEX FILE
  33 C                  (=0 TO GET INDEX BUFFER FROM THE GRIB FILE)
  34 C     JG           INTEGER MAXIMUM NUMBER OF BYTES IN THE GRIB MESSAGE
  35 C     J            INTEGER NUMBER OF MESSAGES TO SKIP
  36 C                  (=0 TO SEARCH FROM BEGINNING)
  37 C                  (<0 TO READ INDEX BUFFER AND SKIP -1-J MESSAGES)
  38 C     JPDS         INTEGER (200) PDS PARAMETERS FOR WHICH TO SEARCH
  39 C                  (=-1 FOR WILDCARD)
  40 C          (1)   - ID OF CENTER
  41 C          (2)   - GENERATING PROCESS ID NUMBER
  42 C          (3)   - GRID DEFINITION
  43 C          (4)   - GDS/BMS FLAG (RIGHT ADJ COPY OF OCTET 8)
  44 C          (5)   - INDICATOR OF PARAMETER
  45 C          (6)   - TYPE OF LEVEL
  46 C          (7)   - HEIGHT/PRESSURE , ETC OF LEVEL
  47 C          (8)   - YEAR INCLUDING (CENTURY-1)
  48 C          (9)   - MONTH OF YEAR
  49 C          (10)  - DAY OF MONTH
  50 C          (11)  - HOUR OF DAY
  51 C          (12)  - MINUTE OF HOUR
  52 C          (13)  - INDICATOR OF FORECAST TIME UNIT
  53 C          (14)  - TIME RANGE 1
  54 C          (15)  - TIME RANGE 2
  55 C          (16)  - TIME RANGE FLAG
  56 C          (17)  - NUMBER INCLUDED IN AVERAGE
  57 C          (18)  - VERSION NR OF GRIB SPECIFICATION
  58 C          (19)  - VERSION NR OF PARAMETER TABLE
  59 C          (20)  - NR MISSING FROM AVERAGE/ACCUMULATION
  60 C          (21)  - CENTURY OF REFERENCE TIME OF DATA
  61 C          (22)  - UNITS DECIMAL SCALE FACTOR
  62 C          (23)  - SUBCENTER NUMBER
  63 C          (24)  - PDS BYTE 29, FOR NMC ENSEMBLE PRODUCTS
  64 C                  128 IF FORECAST FIELD ERROR
  65 C                   64 IF BIAS CORRECTED FCST FIELD
  66 C                   32 IF SMOOTHED FIELD
  67 C                  WARNING: CAN BE COMBINATION OF MORE THAN 1
  68 C          (25)  - PDS BYTE 30, NOT USED
  69 C     JGDS         INTEGER (200) GDS PARAMETERS FOR WHICH TO SEARCH
  70 C                  (ONLY SEARCHED IF JPDS(3)=255)
  71 C                  (=-1 FOR WILDCARD)
  72 C          (1)   - DATA REPRESENTATION TYPE
  73 C          (19)  - NUMBER OF VERTICAL COORDINATE PARAMETERS
  74 C          (20)  - OCTET NUMBER OF THE LIST OF VERTICAL COORDINATE
  75 C                  PARAMETERS
  76 C                  OR
  77 C                  OCTET NUMBER OF THE LIST OF NUMBERS OF POINTS
  78 C                  IN EACH ROW
  79 C                  OR
  80 C                  255 IF NEITHER ARE PRESENT
  81 C          (21)  - FOR GRIDS WITH PL, NUMBER OF POINTS IN GRID
  82 C          (22)  - NUMBER OF WORDS IN EACH ROW
  83 C       LATITUDE/LONGITUDE GRIDS
  84 C          (2)   - N(I) NR POINTS ON LATITUDE CIRCLE
  85 C          (3)   - N(J) NR POINTS ON LONGITUDE MERIDIAN
  86 C          (4)   - LA(1) LATITUDE OF ORIGIN
  87 C          (5)   - LO(1) LONGITUDE OF ORIGIN
  88 C          (6)   - RESOLUTION FLAG (RIGHT ADJ COPY OF OCTET 17)
  89 C          (7)   - LA(2) LATITUDE OF EXTREME POINT
  90 C          (8)   - LO(2) LONGITUDE OF EXTREME POINT
  91 C          (9)   - DI LONGITUDINAL DIRECTION OF INCREMENT
  92 C          (10)  - DJ LATITUDINAL DIRECTION INCREMENT
  93 C          (11)  - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
  94 C       GAUSSIAN  GRIDS
  95 C          (2)   - N(I) NR POINTS ON LATITUDE CIRCLE
  96 C          (3)   - N(J) NR POINTS ON LONGITUDE MERIDIAN
  97 C          (4)   - LA(1) LATITUDE OF ORIGIN
  98 C          (5)   - LO(1) LONGITUDE OF ORIGIN
  99 C          (6)   - RESOLUTION FLAG  (RIGHT ADJ COPY OF OCTET 17)
 100 C          (7)   - LA(2) LATITUDE OF EXTREME POINT
 101 C          (8)   - LO(2) LONGITUDE OF EXTREME POINT
 102 C          (9)   - DI LONGITUDINAL DIRECTION OF INCREMENT
 103 C          (10)  - N - NR OF CIRCLES POLE TO EQUATOR
 104 C          (11)  - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
 105 C          (12)  - NV - NR OF VERT COORD PARAMETERS
 106 C          (13)  - PV - OCTET NR OF LIST OF VERT COORD PARAMETERS
 107 C                             OR
 108 C                  PL - LOCATION OF THE LIST OF NUMBERS OF POINTS IN
 109 C                       EACH ROW (IF NO VERT COORD PARAMETERS
 110 C                       ARE PRESENT
 111 C                             OR
 112 C                  255 IF NEITHER ARE PRESENT
 113 C       POLAR STEREOGRAPHIC GRIDS
 114 C          (2)   - N(I) NR POINTS ALONG LAT CIRCLE
 115 C          (3)   - N(J) NR POINTS ALONG LON CIRCLE
 116 C          (4)   - LA(1) LATITUDE OF ORIGIN
 117 C          (5)   - LO(1) LONGITUDE OF ORIGIN
 118 C          (6)   - RESOLUTION FLAG  (RIGHT ADJ COPY OF OCTET 17)
 119 C          (7)   - LOV GRID ORIENTATION
 120 C          (8)   - DX - X DIRECTION INCREMENT
 121 C          (9)   - DY - Y DIRECTION INCREMENT
 122 C          (10)  - PROJECTION CENTER FLAG
 123 C          (11)  - SCANNING MODE (RIGHT ADJ COPY OF OCTET 28)
 124 C       SPHERICAL HARMONIC COEFFICIENTS
 125 C          (2)   - J PENTAGONAL RESOLUTION PARAMETER
 126 C          (3)   - K      "          "         "
 127 C          (4)   - M      "          "         "
 128 C          (5)   - REPRESENTATION TYPE
 129 C          (6)   - COEFFICIENT STORAGE MODE
 130 C       MERCATOR GRIDS
 131 C          (2)   - N(I) NR POINTS ON LATITUDE CIRCLE
 132 C          (3)   - N(J) NR POINTS ON LONGITUDE MERIDIAN
 133 C          (4)   - LA(1) LATITUDE OF ORIGIN
 134 C          (5)   - LO(1) LONGITUDE OF ORIGIN
 135 C          (6)   - RESOLUTION FLAG (RIGHT ADJ COPY OF OCTET 17)
 136 C          (7)   - LA(2) LATITUDE OF LAST GRID POINT
 137 C          (8)   - LO(2) LONGITUDE OF LAST GRID POINT
 138 C          (9)   - LATIT - LATITUDE OF PROJECTION INTERSECTION
 139 C          (10)  - RESERVED
 140 C          (11)  - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
 141 C          (12)  - LONGITUDINAL DIR GRID LENGTH
 142 C          (13)  - LATITUDINAL DIR GRID LENGTH
 143 C       LAMBERT CONFORMAL GRIDS
 144 C          (2)   - NX NR POINTS ALONG X-AXIS
 145 C          (3)   - NY NR POINTS ALONG Y-AXIS
 146 C          (4)   - LA1 LAT OF ORIGIN (LOWER LEFT)
 147 C          (5)   - LO1 LON OF ORIGIN (LOWER LEFT)
 148 C          (6)   - RESOLUTION (RIGHT ADJ COPY OF OCTET 17)
 149 C          (7)   - LOV - ORIENTATION OF GRID
 150 C          (8)   - DX - X-DIR INCREMENT
 151 C          (9)   - DY - Y-DIR INCREMENT
 152 C          (10)  - PROJECTION CENTER FLAG
 153 C          (11)  - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
 154 C          (12)  - LATIN 1 - FIRST LAT FROM POLE OF SECANT CONE INTER
 155 C          (13)  - LATIN 2 - SECOND LAT FROM POLE OF SECANT CONE INTER
 156 C     MBUF         INTEGER LENGTH OF INDEX BUFFER IN BYTES
 157 C     CBUF         CHARACTER*1 (MBUF) INDEX BUFFER
 158 C                  (INITIALIZE BY SETTING J=-1)
 159 C     NLEN         INTEGER LENGTH OF EACH INDEX RECORD IN BYTES
 160 C                  (INITIALIZE BY SETTING J=-1)
 161 C     NNUM         INTEGER NUMBER OF INDEX RECORDS
 162 C                  (INITIALIZE BY SETTING J=-1)
 163 C     MNUM         INTEGER NUMBER OF INDEX RECORDS SKIPPED
 164 C                  (INITIALIZE BY SETTING J=-1)
 165 C   OUTPUT ARGUMENTS:
 166 C     CBUF         CHARACTER*1 (MBUF) INDEX BUFFER
 167 C     NLEN         INTEGER LENGTH OF EACH INDEX RECORD IN BYTES
 168 C     NNUM         INTEGER NUMBER OF INDEX RECORDS
 169 C     MNUM         INTEGER NUMBER OF INDEX RECORDS SKIPPED
 170 C     KG           INTEGER NUMBER OF BYTES IN THE GRIB MESSAGE
 171 C     K            INTEGER MESSAGE NUMBER UNPACKED
 172 C                  (CAN BE SAME AS J IN CALLING PROGRAM
 173 C                  IN ORDER TO FACILITATE MULTIPLE SEARCHES)
 174 C     KPDS         INTEGER (200) UNPACKED PDS PARAMETERS
 175 C     KGDS         INTEGER (200) UNPACKED GDS PARAMETERS
 176 C     G            CHARACTER*1 (KG) GRIB MESSAGE
 177 C     IRET         INTEGER RETURN CODE
 178 C                    0      ALL OK
 179 C                    96     ERROR READING INDEX FILE
 180 C                    97     ERROR READING GRIB FILE
 181 C                    98     NUMBER OF BYTES GREATER THAN JG
 182 C                    99     REQUEST NOT FOUND
 183 C
 184 C SUBPROGRAMS CALLED:
 185 C   GETGI          READ INDEX FILE
 186 C   GETGIR         READ INDEX BUFFER FROM GRIB FILE
 187 C   GETGB1S        SEARCH INDEX RECORDS
 188 C   BAREAD         READ GRIB RECORD
 189 C
 190 C REMARKS: SPECIFY AN INDEX FILE IF FEASIBLE TO INCREASE SPEED.
 191 C   SUBPROGRAM CAN BE CALLED FROM A MULTIPROCESSING ENVIRONMENT.
 192 C   DO NOT ENGAGE THE SAME LOGICAL UNIT FROM MORE THAN ONE PROCESSOR.
 193 C
 194 C ATTRIBUTES:
 195 C   LANGUAGE: FORTRAN 77
 196 C   MACHINE:  CRAY, WORKSTATIONS
 197 C
 198 C$$$
 199       INTEGER JPDS(200),JGDS(200)
 200       INTEGER KPDS(200),KGDS(200)
 201       CHARACTER CBUF(MBUF)
 202       CHARACTER G(JG)
 203       PARAMETER(MSK1=32000,MSK2=4000)
 204       INTEGER JENS(200),KENS(200)
 205 C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 206 C  SEARCH PREVIOUS INDEX BUFFER IF POSSIBLE
 207       JENS=-1
 208       IF(J.GE.0) THEN
 209         IF(MNUM.GE.0) THEN
 210           IRGI=0
 211         ELSE
 212           MNUM=-1-MNUM
 213           IRGI=1
 214         ENDIF
 215         JR=J-MNUM
 216         IF(JR.GE.0.AND.(JR.LT.NNUM.OR.IRGI.EQ.0)) THEN
 217           CALL GETGB1S(CBUF,NLEN,NNUM,JR,JPDS,JGDS,JENS,
 218      &                 KR,KPDS,KGDS,KENS,LSKIP,LGRIB,IRGS)
 219           IF(IRGS.EQ.0) K=KR+MNUM
 220           IF(IRGI.EQ.1.AND.IRGS.EQ.0) MNUM=-1-MNUM
 221           IF(IRGI.EQ.1.AND.IRGS.GT.0) MNUM=MNUM+NNUM
 222         ELSE
 223           MNUM=J
 224           IRGI=1
 225           IRGS=1
 226         ENDIF
 227       ELSE
 228         MNUM=-1-J
 229         IRGI=1
 230         IRGS=1
 231       ENDIF
 232 C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 233 C  READ AND SEARCH NEXT INDEX BUFFER
 234       JR=0
 235       DOWHILE(IRGI.EQ.1.AND.IRGS.EQ.1)
 236         IF(LUGI.GT.0) THEN
 237           CALL GETGI(LUGI,MNUM,MBUF,CBUF,NLEN,NNUM,IRGI)
 238         ELSE
 239           CALL GETGIR(LUGB,MSK1,MSK2,MNUM,MBUF,CBUF,NLEN,NNUM,IRGI)
 240         ENDIF
 241         IF(IRGI.LE.1) THEN
 242           CALL GETGB1S(CBUF,NLEN,NNUM,JR,JPDS,JGDS,JENS,
 243      &                 KR,KPDS,KGDS,KENS,LSKIP,LGRIB,IRGS)
 244           IF(IRGS.EQ.0) K=KR+MNUM
 245           IF(IRGI.EQ.1.AND.IRGS.EQ.0) MNUM=-1-MNUM
 246           IF(IRGI.EQ.1.AND.IRGS.GT.0) MNUM=MNUM+NNUM
 247         ENDIF
 248       ENDDO
 249 C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 250 C  READ GRIB RECORD
 251       IF(IRGI.GT.1) THEN
 252         IRET=96
 253       ELSEIF(IRGS.NE.0) THEN
 254         IRET=99
 255       ELSEIF(LGRIB.GT.JG) THEN
 256         IRET=98
 257       ELSE
 258         IRET=97
 259         CALL BAREAD(LUGB,LSKIP,LGRIB,KG,G)
 260         IF(KG.EQ.LGRIB) IRET=0
 261       ENDIF
 262 C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 263       RETURN
 264       END