mirror of https://github.com/ecmwf/eccodes.git
111 lines
3.9 KiB
Fortran
111 lines
3.9 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 :: numberOfPointsAlongAParallel
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integer :: 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
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character(len=10) :: open_mode='r'
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call codes_open_file(ifile, &
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'../../data/reduced_latlon_surface.grib1', open_mode)
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! Loop on all the messages in a file.
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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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LOOP: DO WHILE (iret /= CODES_END_OF_FILE)
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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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endif
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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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call codes_grib_new_from_file(ifile,igrib, iret)
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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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