mirror of https://github.com/ecmwf/eccodes.git
71 lines
2.1 KiB
Fortran
71 lines
2.1 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 use an iterator on lat/lon/values.
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!
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!
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program iterator
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use eccodes
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implicit none
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integer :: ifile
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integer :: iret, iter
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real(kind=8) :: lat, lon, value, missingValue
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integer :: n, flags
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! Message identifier.
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integer :: igrib
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ifile = 5
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call codes_open_file(ifile, &
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'../../data/regular_latlon_surface_constant.grib1', 'R')
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! Loop on all the messages in a file.
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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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! get as a real8
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call codes_get(igrib, &
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'missingValue', missingValue)
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write (*, *) 'missingValue=', missingValue
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! A new iterator on lat/lon/values is created from the message igrib
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flags = 0
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call grib_iterator_new(igrib, iter, flags)
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n = 0
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! Loop on all the lat/lon/values.
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call grib_iterator_next(iter, lat, lon, value, iret)
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do while (iret .ne. 0)
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! You can now print lat and lon,
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if (value .eq. missingValue) then
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! decide what to print if a missing value is found.
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write (*, *) "- ", n, " - lat=", lat, " lon=", lon, " value=missing"
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else
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! or print the value if is not missing.
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write (*, *) " ", n, " lat=", lat, " lon=", lon, " value=", value
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end if
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n = n + 1
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call grib_iterator_next(iter, lat, lon, value, iret)
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end do
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! At the end the iterator is deleted to free memory.
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call grib_iterator_delete(iter)
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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 iterator
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