mirror of https://github.com/ecmwf/eccodes.git
112 lines
4.2 KiB
Fortran
112 lines
4.2 KiB
Fortran
! (C) Copyright 2005- ECMWF.
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!
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! This software is licensed under the terms of the Apache Licence Version 2.0
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! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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!
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! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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!
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!
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! Description: How to get values using keys from GRIB messages
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!
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!
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program grib_get_keys
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use eccodes
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implicit none
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integer :: ifile
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integer :: iret
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integer :: igrib
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real :: latitudeOfFirstPointInDegrees
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real :: longitudeOfFirstPointInDegrees
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real :: latitudeOfLastPointInDegrees
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real :: longitudeOfLastPointInDegrees
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integer(4) :: numberOfPointsAlongAParallel
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integer(8) :: numberOfPointsAlongAMeridian
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real, dimension(:), allocatable :: values
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integer :: numberOfValues
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real :: average, min_val, max_val
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integer :: is_missing, is_defined
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character(len=10) :: open_mode = 'r'
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call codes_open_file(ifile, '../../data/reduced_latlon_surface.grib1', open_mode)
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! loop on all the messages in a file
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LOOP: DO WHILE (.true.)
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! a new GRIB message is loaded from file.
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! igrib is the grib id to be used in subsequent calls
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call codes_grib_new_from_file(ifile, igrib, iret)
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if (iret == CODES_END_OF_FILE) exit LOOP
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! check key is defined
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is_defined = 0
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call codes_is_defined(igrib, 'Ni', is_defined)
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write (*, *) 'Key Ni is defined? ', is_defined
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! check if the value of the key is MISSING
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is_missing = 0
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call codes_is_missing(igrib, 'Ni', is_missing)
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if (is_missing /= 1) then
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! key value is not missing so get as an integer
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call codes_get(igrib, 'Ni', numberOfPointsAlongAParallel)
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write (*, *) 'numberOfPointsAlongAParallel=', &
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numberOfPointsAlongAParallel
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else
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write (*, *) 'numberOfPointsAlongAParallel is missing'
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end if
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! get as an integer
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call codes_get(igrib, 'Nj', numberOfPointsAlongAMeridian)
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write (*, *) 'numberOfPointsAlongAMeridian=', &
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numberOfPointsAlongAMeridian
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! get as a real
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call codes_get(igrib, 'latitudeOfFirstGridPointInDegrees', &
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latitudeOfFirstPointInDegrees)
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write (*, *) 'latitudeOfFirstGridPointInDegrees=', &
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latitudeOfFirstPointInDegrees
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! get as a real
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call codes_get(igrib, 'longitudeOfFirstGridPointInDegrees', &
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longitudeOfFirstPointInDegrees)
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write (*, *) 'longitudeOfFirstGridPointInDegrees=', &
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longitudeOfFirstPointInDegrees
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! get as a real
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call codes_get(igrib, 'latitudeOfLastGridPointInDegrees', &
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latitudeOfLastPointInDegrees)
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write (*, *) 'latitudeOfLastGridPointInDegrees=', &
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latitudeOfLastPointInDegrees
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! get as a real
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call codes_get(igrib, 'longitudeOfLastGridPointInDegrees', &
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longitudeOfLastPointInDegrees)
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write (*, *) 'longitudeOfLastGridPointInDegrees=', &
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longitudeOfLastPointInDegrees
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! get the size of the values array
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call codes_get_size(igrib, 'values', numberOfValues)
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write (*, *) 'numberOfValues=', numberOfValues
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allocate (values(numberOfValues), stat=iret)
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! get data values
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call codes_get(igrib, 'values', values)
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call codes_get(igrib, 'min', min_val) ! can also be obtained through minval(values)
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call codes_get(igrib, 'max', max_val) ! can also be obtained through maxval(values)
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call codes_get(igrib, 'average', average) ! can also be obtained through maxval(values)
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deallocate (values)
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write (*, *) 'There are ', numberOfValues, &
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' average is ', average, &
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' min is ', min_val, &
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' max is ', max_val
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call codes_release(igrib)
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end do LOOP
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call codes_close_file(ifile)
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end program grib_get_keys
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