mirror of https://github.com/ecmwf/eccodes.git
71 lines
2.0 KiB
Fortran
71 lines
2.0 KiB
Fortran
! Copyright 2005-2017 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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endif
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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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