[61e07ba] | 1 | MODULE class_gribfile |
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| 2 | |
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| 3 | !***************************************************************** |
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| 4 | ! * |
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| 5 | ! This is a class-like structure for providing access to the * |
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| 6 | ! metadata and data within a GRIB met file * |
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| 7 | ! * |
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| 8 | ! * |
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| 9 | !***************************************************************** |
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| 10 | |
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| 11 | IMPLICIT NONE |
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| 12 | PRIVATE ! The default is that everything is private, unless |
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| 13 | ! specified otherwise |
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| 14 | |
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| 15 | ! Note that all public interfaces and variables should have a |
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| 16 | ! GRIBFILE_ prefix |
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| 17 | |
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| 18 | PUBLIC :: gribfile_object, & |
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| 19 | gribfile_object_create, & |
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| 20 | gribfile_printobj, & |
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| 21 | gribfile_centre, & |
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| 22 | gribfile_num_xlon, & |
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| 23 | gribfile_num_ylat, & |
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| 24 | gribfile_num_zlevel |
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| 25 | |
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| 26 | |
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| 27 | PUBLIC :: GRIBFILE_TYPE_ECMWF_GRIB1, & |
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| 28 | GRIBFILE_TYPE_ECMWF_GRIB2, & |
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| 29 | GRIBFILE_TYPE_ECMWF_GRIB1_2, & |
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| 30 | GRIBFILE_TYPE_NCEP_GRIB1, & |
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| 31 | GRIBFILE_TYPE_NCEP_GRIB2, & |
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| 32 | GRIBFILE_TYPE_UNKNOWN, & |
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| 33 | GRIBFILE_CENTRE_NCEP, & |
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| 34 | GRIBFILE_CENTRE_ECMWF, & |
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| 35 | GRIBFILE_CENTRE_UNKNOWN |
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| 36 | |
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| 37 | ! These are codes for designating the type of GRIB file |
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| 38 | ! being looked at |
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| 39 | INTEGER, PARAMETER :: GRIBFILE_TYPE_ECMWF_GRIB1 = 1, & |
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| 40 | GRIBFILE_TYPE_ECMWF_GRIB2 = 2, & |
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| 41 | GRIBFILE_TYPE_ECMWF_GRIB1_2 = 3, & |
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| 42 | GRIBFILE_TYPE_NCEP_GRIB1 = 4, & |
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| 43 | GRIBFILE_TYPE_NCEP_GRIB2 = 5, & |
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| 44 | GRIBFILE_TYPE_UNKNOWN = -9999, & |
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| 45 | GRIBFILE_CENTRE_NCEP = 1, & |
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| 46 | GRIBFILE_CENTRE_ECMWF = 2, & |
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| 47 | GRIBFILE_CENTRE_UNKNOWN = -9999 |
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| 48 | |
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| 49 | ! These are the official centre codes for NCEP and ECMWF in grib files. |
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| 50 | INTEGER, PARAMETER :: CENTRE_NCEP = 7, CENTRE_ECMWF = 98 |
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| 51 | |
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| 52 | TYPE gribfile_object |
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| 53 | PRIVATE ! Make everything in here private so it's not directly manipulated outside |
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| 54 | LOGICAL :: is_instantiated = .FALSE. |
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| 55 | CHARACTER(LEN=256) :: file_path = '' |
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| 56 | INTEGER :: grib_edition = 0 ! Not sure we want this, since it can vary on hybrid files |
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| 57 | INTEGER :: grib_centre = GRIBFILE_CENTRE_UNKNOWN |
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| 58 | INTEGER :: gribfile_type = GRIBFILE_TYPE_UNKNOWN |
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| 59 | INTEGER :: num_xlon = -9999 |
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| 60 | INTEGER :: num_ylat = -9999 |
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| 61 | INTEGER :: num_zlevel = -9999 |
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| 62 | END TYPE gribfile_object |
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| 63 | |
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| 64 | |
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| 65 | |
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| 66 | CONTAINS |
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| 67 | |
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| 68 | SUBROUTINE gribfile_testhello() |
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| 69 | PRINT *, 'Hello gribfile' |
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| 70 | END SUBROUTINE gribfile_testhello |
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| 71 | |
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| 72 | |
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| 73 | |
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| 74 | TYPE(gribfile_object) FUNCTION gribfile_object_create(filepath) |
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| 75 | |
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| 76 | ! This is the "constructor" for the pseudo gribfile object. Given the path to a gribfile, |
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| 77 | ! fills in attributes that can be accessed through methods in this |
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| 78 | ! module |
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| 79 | |
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| 80 | USE grib_api |
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| 81 | |
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| 82 | IMPLICIT NONE |
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| 83 | |
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| 84 | CHARACTER(LEN=*), INTENT(IN) :: filepath ! full path to GRIB file |
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| 85 | |
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| 86 | TYPE(gribfile_object) :: returned_object |
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| 87 | |
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| 88 | INTEGER :: ifile, iret, igrib, grib_centre, gribfile_type |
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| 89 | INTEGER :: xlon, ylat, zlev |
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| 90 | |
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| 91 | |
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| 92 | CALL get_centre_and_type(filepath, grib_centre, gribfile_type) |
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| 93 | returned_object%grib_centre = grib_centre |
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| 94 | returned_object%gribfile_type = gribfile_type |
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| 95 | |
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| 96 | ! Get dimensions of 3d u field |
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| 97 | CALL get_3d_u_dims(filepath, gribfile_type, xlon, ylat, zlev) |
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| 98 | returned_object%num_xlon = xlon |
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| 99 | returned_object%num_ylat = ylat |
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| 100 | returned_object%num_zlevel = zlev |
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| 101 | |
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| 102 | |
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| 103 | returned_object%is_instantiated = .TRUE. |
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| 104 | returned_object%file_path = TRIM(filepath) |
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| 105 | |
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| 106 | gribfile_object_create = returned_object |
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| 107 | |
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| 108 | END FUNCTION gribfile_object_create |
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| 109 | |
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| 110 | |
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| 111 | SUBROUTINE gribfile_printobj(gribfile_obj) |
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| 112 | |
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| 113 | ! Pretty prints the attributes of the gribfile pseudo-object |
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| 114 | TYPE(gribfile_object), INTENT(IN) :: gribfile_obj |
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| 115 | |
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| 116 | PRINT *, 'is_instantiated: ', gribfile_obj%is_instantiated |
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| 117 | PRINT *, 'filepath: ', TRIM(gribfile_obj%file_path) |
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| 118 | PRINT *, 'grib_centre: ', gribfile_obj%grib_centre |
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| 119 | PRINT *, 'gribfile_type: ', gribfile_obj%gribfile_type |
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| 120 | PRINT *, 'num_xlon: ', gribfile_obj%num_xlon |
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| 121 | PRINT *, 'num_ylat: ', gribfile_obj%num_ylat |
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| 122 | PRINT *, 'num_zlevel: ', gribfile_obj%num_zlevel |
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| 123 | |
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| 124 | END SUBROUTINE gribfile_printobj |
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| 125 | |
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| 126 | INTEGER FUNCTION gribfile_centre(filepath) |
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| 127 | |
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| 128 | ! Returns an integer constant denoting the grib centre (currently either ECMWF, NCEP or UNKNOWN) |
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| 129 | ! for the specified filepath. Returns one of the GRIBFILE_CENTRE_ constants defined at top of this |
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| 130 | ! module. |
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| 131 | |
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| 132 | |
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| 133 | USE grib_api |
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| 134 | |
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| 135 | IMPLICIT NONE |
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| 136 | |
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| 137 | CHARACTER(LEN=*), INTENT(IN) :: filepath ! full path to GRIB file |
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| 138 | |
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| 139 | |
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| 140 | |
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| 141 | INTEGER :: ifile, iret, igrib, grib_centre |
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| 142 | |
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| 143 | CALL grib_open_file(ifile, filepath, 'r', iret) |
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| 144 | IF (iret == 0) THEN |
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| 145 | ! Use first record to detect centre, which is assumed constant |
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| 146 | ! amongst all messages |
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| 147 | CALL grib_new_from_file(ifile, igrib, iret) |
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| 148 | CALL grib_get(igrib, 'centre', grib_centre) |
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| 149 | CALL grib_close_file(ifile) |
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| 150 | ELSE |
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| 151 | PRINT *, "WARNING: problem opening GRIB file: ", filepath |
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| 152 | grib_centre = -999 |
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| 153 | END IF |
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| 154 | |
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| 155 | |
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| 156 | |
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| 157 | |
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| 158 | |
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| 159 | IF (grib_centre == CENTRE_NCEP) THEN |
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| 160 | gribfile_centre = GRIBFILE_CENTRE_NCEP |
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| 161 | ELSE IF (grib_centre == CENTRE_ECMWF) THEN |
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| 162 | gribfile_centre = GRIBFILE_CENTRE_ECMWF |
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| 163 | ELSE |
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| 164 | gribfile_centre = GRIBFILE_CENTRE_UNKNOWN |
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| 165 | END IF |
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| 166 | |
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| 167 | END FUNCTION gribfile_centre |
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| 168 | |
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| 169 | |
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| 170 | ! This is currently a PRIVATE subroutine |
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| 171 | SUBROUTINE get_centre_and_type(filepath, grib_centre, gribfile_type) |
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| 172 | ! Given specified grib file, passes back centre and gribfile |
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| 173 | ! type to the calling program. Numeric codes are defined as integer parameters |
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| 174 | ! in this module |
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| 175 | |
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| 176 | ! To get this information, we have to iterate through the entire file in order to |
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| 177 | ! determine if it is hybrid or not |
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| 178 | ! |
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| 179 | |
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| 180 | USE grib_api |
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| 181 | IMPLICIT NONE |
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| 182 | CHARACTER(LEN=*), INTENT(IN) :: filepath ! full path to GRIB file |
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| 183 | INTEGER, INTENT(OUT) :: grib_centre, gribfile_type |
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| 184 | |
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| 185 | INTEGER :: fileptr, iret, igrib, centre, grib_edition |
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| 186 | LOGICAL :: end_of_file |
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| 187 | LOGICAL :: grib1_detected, grib2_detected |
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| 188 | |
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| 189 | |
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| 190 | grib1_detected = .FALSE. |
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| 191 | grib2_detected = .FALSE. |
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| 192 | |
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| 193 | CALL grib_open_file(fileptr, filepath, 'r', iret) |
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| 194 | IF (iret /= 0) THEN |
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| 195 | PRINT *, 'class_gributils:get_centre_and_type()...' |
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| 196 | PRINT *, ' unable to open filepath: ', filepath |
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| 197 | STOP |
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| 198 | END IF |
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| 199 | |
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| 200 | |
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| 201 | ! Use first record to detect centre and and grib version of first messages. We will |
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| 202 | ! then assume that all following messages have same centre, but not necessarily same |
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| 203 | ! GRIB version |
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| 204 | CALL grib_new_from_file(fileptr, igrib, iret) |
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| 205 | CALL grib_get(igrib, 'centre', grib_centre) |
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| 206 | CALL grib_get(igrib, 'edition', grib_edition) |
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| 207 | |
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| 208 | IF (grib_edition == 1) grib1_detected = .TRUE. |
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| 209 | IF (grib_edition == 2) grib2_detected = .TRUE. |
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| 210 | |
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| 211 | ! Now, iterate through the rest of records to determine if this is a mixed edition file |
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| 212 | end_of_file = .FALSE. |
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| 213 | DO WHILE (.NOT. end_of_file) |
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| 214 | CALL grib_new_from_file(fileptr, igrib, iret) |
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| 215 | IF (iret .eq. GRIB_END_OF_FILE) THEN |
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| 216 | end_of_file = .TRUE. |
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| 217 | ELSE |
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| 218 | |
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| 219 | ! Get edition from file |
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| 220 | CALL grib_get(igrib, 'edition', grib_edition) |
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| 221 | IF (grib_edition .eq. 1) grib1_detected = .TRUE. |
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| 222 | IF (grib_edition .eq. 2) grib2_detected = .TRUE. |
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| 223 | END IF |
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| 224 | END DO |
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| 225 | |
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| 226 | CALL grib_close_file(fileptr) |
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| 227 | |
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| 228 | ! Determine the gribfile type depending on centre and edition(s) |
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| 229 | IF (grib_centre == CENTRE_ECMWF) THEN |
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| 230 | IF (grib1_detected .AND. grib2_detected) THEN |
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| 231 | gribfile_type = GRIBFILE_TYPE_ECMWF_GRIB1_2 |
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| 232 | ELSE IF (grib1_detected .AND. .NOT. grib2_detected) THEN |
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| 233 | gribfile_type = GRIBFILE_TYPE_ECMWF_GRIB1 |
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| 234 | ELSE IF (.NOT. grib1_detected .AND. grib2_detected) THEN |
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| 235 | gribfile_type = GRIBFILE_TYPE_ECMWF_GRIB2 |
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| 236 | ELSE |
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| 237 | gribfile_type = GRIBFILE_TYPE_UNKNOWN |
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| 238 | ENDIF |
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| 239 | ELSE IF (grib_centre == CENTRE_NCEP) THEN |
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| 240 | IF (grib1_detected .AND. .NOT. grib2_detected) THEN |
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| 241 | gribfile_type = GRIBFILE_TYPE_NCEP_GRIB1 |
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| 242 | ELSE IF (.NOT. grib1_detected .AND. grib2_detected) THEN |
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| 243 | gribfile_type = GRIBFILE_TYPE_NCEP_GRIB2 |
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| 244 | ELSE |
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| 245 | gribfile_type = GRIBFILE_TYPE_UNKNOWN |
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| 246 | ENDIF |
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| 247 | ELSE |
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| 248 | gribfile_type = GRIBFILE_TYPE_UNKNOWN |
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| 249 | ENDIF |
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| 250 | |
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| 251 | END SUBROUTINE get_centre_and_type |
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| 252 | |
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| 253 | |
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| 254 | SUBROUTINE get_3d_u_dims(filepath, gribfile_type, xlon, ylat, zlev) |
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| 255 | |
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| 256 | ! Looks at the 3d u fields in the GRIBFILE to get x and y dims, as well as number of levels |
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| 257 | USE grib_api |
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| 258 | |
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| 259 | IMPLICIT NONE |
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| 260 | |
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| 261 | CHARACTER(LEN=*), INTENT(IN) :: filepath ! full path to GRIB file |
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| 262 | INTEGER, INTENT(IN) :: gribfile_type |
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| 263 | INTEGER, INTENT(OUT) :: xlon, ylat, zlev |
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| 264 | |
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| 265 | INTEGER :: ifile, iret, igrib, grib_centre |
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| 266 | LOGICAL :: end_of_file |
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| 267 | |
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| 268 | ! These will be assigned according to type of grib file, then used to filter |
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| 269 | ! for the 3d messages |
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| 270 | ! Name of the key being sought |
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| 271 | CHARACTER(LEN=64) :: keyname_leveltype, keyname_shortname, keyname_level, & |
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| 272 | keyname_xlon, keyname_ylat |
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| 273 | |
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| 274 | ! The key value being filtered for |
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| 275 | CHARACTER(LEN=64) :: keyvalue_leveltype, keyvalue_shortname |
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| 276 | |
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| 277 | ! Actual values read in from the grib file |
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| 278 | CHARACTER(LEN=64) :: value_leveltype, value_shortname |
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| 279 | INTEGER :: value_level |
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| 280 | |
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| 281 | INTEGER :: num_levels |
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| 282 | |
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| 283 | ! Get the field names to read, based on the type of grib file |
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| 284 | |
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| 285 | !!! Note that ALL of these have the same key names, except that |
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| 286 | !!! leveltype is 'hybrid' in ECMWF and 'isobaricInhPa' in NCEP. |
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| 287 | !!! This could probably be consolidated, but because these are |
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| 288 | !!! files that go through some preprocessing, and aren't |
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| 289 | !!! necessarily standard (at least for ECMWF), I'm going to be |
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| 290 | !!! safe and leave it as is for now, so it would be easier to |
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| 291 | !!! modify for one type, if necessary. |
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| 292 | IF (gribfile_type == GRIBFILE_TYPE_ECMWF_GRIB1) THEN |
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| 293 | keyname_leveltype = 'typeOfLevel' |
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| 294 | keyname_shortname = 'shortName' |
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| 295 | keyname_level = 'level' |
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| 296 | keyvalue_leveltype = 'hybrid' |
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| 297 | keyvalue_shortname = 'u' |
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| 298 | keyname_xlon = 'Ni' |
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| 299 | keyname_ylat = 'Nj' |
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| 300 | ELSE IF (gribfile_type == GRIBFILE_TYPE_ECMWF_GRIB1_2) THEN |
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| 301 | keyname_leveltype = 'typeOfLevel' |
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| 302 | keyname_shortname = 'shortName' |
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| 303 | keyname_level = 'level' |
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| 304 | keyvalue_leveltype = 'hybrid' |
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| 305 | keyvalue_shortname = 'u' |
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| 306 | keyname_xlon = 'Ni' |
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| 307 | keyname_ylat = 'Nj' |
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| 308 | ELSE IF (gribfile_type == GRIBFILE_TYPE_ECMWF_GRIB2) THEN |
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| 309 | keyname_leveltype = 'typeOfLevel' |
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| 310 | keyname_shortname = 'shortName' |
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| 311 | keyname_level = 'level' |
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| 312 | keyvalue_leveltype = 'hybrid' |
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| 313 | keyvalue_shortname = 'u' |
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| 314 | keyname_xlon = 'Ni' |
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| 315 | keyname_ylat = 'Nj' |
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| 316 | ELSE IF (gribfile_type == GRIBFILE_TYPE_NCEP_GRIB1) THEN |
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| 317 | keyname_leveltype = 'typeOfLevel' |
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| 318 | keyname_shortname = 'shortName' |
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| 319 | keyname_level = 'level' |
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| 320 | keyvalue_leveltype = 'isobaricInhPa' |
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| 321 | keyvalue_shortname = 'u' |
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| 322 | keyname_xlon = 'Ni' |
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| 323 | keyname_ylat = 'Nj' |
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| 324 | ELSE IF (gribfile_type == GRIBFILE_TYPE_NCEP_GRIB2) THEN |
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| 325 | keyname_leveltype = 'typeOfLevel' |
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| 326 | keyname_shortname = 'shortName' |
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| 327 | keyname_level = 'level' |
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| 328 | keyvalue_leveltype = 'isobaricInhPa' |
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| 329 | keyvalue_shortname = 'u' |
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| 330 | keyname_xlon = 'Ni' |
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| 331 | keyname_ylat = 'Nj' |
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| 332 | ELSE |
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| 333 | PRINT *, 'class_gribfile:get_3d_u_dims(): Unsupported gribfile type: ', gribfile_type |
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| 334 | STOP |
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| 335 | ENDIF |
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| 336 | |
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| 337 | CALL grib_open_file(ifile, filepath, 'r', iret) |
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| 338 | IF (iret == 0) THEN |
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| 339 | |
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| 340 | ! Iterate through all messages to count 3d u messages (levels) and get x,y dimensions |
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| 341 | end_of_file = .FALSE. |
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| 342 | num_levels = 0 |
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| 343 | DO WHILE (.NOT. end_of_file) |
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| 344 | CALL grib_new_from_file(ifile, igrib, iret) |
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| 345 | IF (iret .eq. GRIB_END_OF_FILE) THEN |
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| 346 | end_of_file = .TRUE. |
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| 347 | ELSE |
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| 348 | |
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| 349 | ! Get relevant keys and filter for the 3d U wind |
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| 350 | CALL grib_get(igrib, keyname_shortname, value_shortname) |
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| 351 | CALL grib_get(igrib, keyname_leveltype, value_leveltype) |
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| 352 | CALL grib_get(igrib, keyname_level, value_level) |
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| 353 | IF ( TRIM(value_leveltype) == TRIM(keyvalue_leveltype) .AND. & |
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| 354 | TRIM(value_shortname) == TRIM(keyvalue_shortname) ) THEN |
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| 355 | |
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| 356 | ! If this is first 3d U wind message, get dimensions |
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| 357 | IF (num_levels == 0) THEN |
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| 358 | CONTINUE |
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| 359 | CALL grib_get(igrib, keyname_xlon, xlon) |
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| 360 | CALL grib_get(igrib, keyname_ylat, ylat) |
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| 361 | ENDIF |
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| 362 | !PRINT *, TRIM(value_shortname), ' ', TRIM(value_leveltype), ' ', value_level |
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| 363 | num_levels = num_levels + 1 |
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| 364 | END IF |
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| 365 | END IF |
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| 366 | END DO |
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| 367 | |
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| 368 | |
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| 369 | ELSE |
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| 370 | PRINT *, "ERROR: class_gribfile::get_3d_u_dims(): problem opening GRIB file: ", filepath |
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| 371 | STOP |
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| 372 | END IF |
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| 373 | |
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| 374 | CALL grib_close_file(ifile) |
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| 375 | |
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| 376 | zlev = num_levels |
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| 377 | |
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| 378 | END SUBROUTINE get_3d_u_dims |
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| 379 | |
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| 380 | |
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| 381 | |
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| 382 | !!! Getter methods |
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| 383 | INTEGER FUNCTION gribfile_num_xlon(gribfile_obj) |
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| 384 | |
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| 385 | ! Returns x (lon) dimension of met data |
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| 386 | TYPE(gribfile_object), INTENT(IN) :: gribfile_obj |
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| 387 | |
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| 388 | IF (.NOT. gribfile_obj%is_instantiated) THEN |
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| 389 | PRINT *, 'ERROR: class_gribfile: gribfile_obj not instantiated' |
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| 390 | ENDIF |
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| 391 | gribfile_num_xlon = gribfile_obj%num_xlon |
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| 392 | |
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| 393 | END FUNCTION gribfile_num_xlon |
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| 394 | |
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| 395 | INTEGER FUNCTION gribfile_num_ylat(gribfile_obj) |
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| 396 | |
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| 397 | ! Returns y (lat) dimension of met data |
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| 398 | TYPE(gribfile_object), INTENT(IN) :: gribfile_obj |
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| 399 | |
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| 400 | IF (.NOT. gribfile_obj%is_instantiated) THEN |
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| 401 | PRINT *, 'ERROR: class_gribfile: gribfile_obj not instantiated' |
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| 402 | ENDIF |
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| 403 | gribfile_num_ylat = gribfile_obj%num_ylat |
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| 404 | |
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| 405 | END FUNCTION gribfile_num_ylat |
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| 406 | |
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| 407 | INTEGER FUNCTION gribfile_num_zlevel(gribfile_obj) |
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| 408 | |
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| 409 | ! Returns z (level) dimension of met data |
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| 410 | TYPE(gribfile_object), INTENT(IN) :: gribfile_obj |
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| 411 | |
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| 412 | IF (.NOT. gribfile_obj%is_instantiated) THEN |
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| 413 | PRINT *, 'ERROR: class_gribfile: gribfile_obj not instantiated' |
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| 414 | ENDIF |
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| 415 | gribfile_num_zlevel = gribfile_obj%num_zlevel |
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| 416 | |
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| 417 | END FUNCTION gribfile_num_zlevel |
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| 418 | |
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| 419 | END MODULE class_gribfile |
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