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! (C) Copyright 2005- ECMWF.
!
! This software is licensed under the terms of the Apache Licence Version 2.0
! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
!
! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
!
!
! Description: how to use an iterator on lat/lon/values.
!
!
program iterator
use eccodes
implicit none
integer :: ifile
integer :: iret, iter
real(kind=8) :: lat, lon, value, missingValue
integer :: n, flags
! Message identifier.
integer :: igrib
ifile = 5
call codes_open_file(ifile, &
'../../data/regular_latlon_surface_constant.grib1', 'R')
! Loop on all the messages in a file
LOOP: DO WHILE (.true.)
call codes_grib_new_from_file(ifile, igrib, iret)
if (iret == CODES_END_OF_FILE) exit LOOP
! get as a real8
call codes_get(igrib, &
'missingValue', missingValue)
write (*, *) 'missingValue=', missingValue
! A new iterator on lat/lon/values is created from the message igrib
flags = 0
call grib_iterator_new(igrib, iter, flags)
n = 0
! Loop on all the lat/lon/values.
call grib_iterator_next(iter, lat, lon, value, iret)
do while (iret .ne. 0)
! You can now print lat and lon,
if (value .eq. missingValue) then
! decide what to print if a missing value is found.
write (*, *) "- ", n, " - lat=", lat, " lon=", lon, " value=missing"
else
! or print the value if is not missing.
write (*, *) " ", n, " lat=", lat, " lon=", lon, " value=", value
end if
n = n + 1
call grib_iterator_next(iter, lat, lon, value, iret)
end do
! At the end the iterator is deleted to free memory.
call grib_iterator_delete(iter)
call codes_release(igrib)
end do LOOP
call codes_close_file(ifile)
end program iterator
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