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C (C) Copyright 2005- ECMWF.
C
C This software is licensed under the terms of the Apache Licence Version 2.0
C which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
C virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
C
C
C
C Fortran 77 Implementation: iterator_fortran
C
C Description: how to use an iterator on lat/lon/values.
C
C
C
C
C
program iterator
implicit none
include 'grib_api_fortran.h'
integer ifile
integer iret,iter
real*8 lat,lon,value,missingValue
integer n,flags
character*256 filename
character*256 error
C Message identifier.
integer igrib
ifile=5
call grib_check(grib_open_file(ifile,
X'../data/regular_latlon_surface.grib1','r'))
C Loop on all the messages in a file.
10 iret=grib_new_from_file(ifile,igrib)
if (igrib .eq. -1 ) then
if (iret .ne.0) then
call grib_check(iret)
endif
stop
endif
C get as a real8
call grib_check(grib_get_real8(igrib
X,'missingValue',missingValue))
write(*,*) 'missingValue=',missingValue
C A new iterator on lat/lon/values is created from the message igrib
flags = 0
call grib_check(grib_iterator_new(igrib,iter,flags))
n = 0
C Loop on all the lat/lon/values.
20 iret = grib_iterator_next(iter,lat,lon,value)
if ( iret .eq. 0 ) goto 30
C You can now print lat and lon,
if ( value .eq. missingValue ) then
C decide what to print if a missing value is found.
write(*,*) "- ",n," - lat=",lat," lon=",lon," value=missing"
else
C or print the value if is not missing.
write(*,*) " ",n," lat=",lat," lon=",lon," value=",value
endif
n=n+1
goto 20
30 continue
C At the end the iterator is deleted to free memory.
call grib_check(grib_iterator_delete(iter))
goto 10
call grib_check(grib_release(igrib))
call grib_check(grib_close_file(ifile))
end
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