mirror of https://github.com/ecmwf/eccodes.git
83 lines
2.1 KiB
Fortran
83 lines
2.1 KiB
Fortran
C Copyright 2005-2017 ECMWF.
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C
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C This software is licensed under the terms of the Apache Licence Version 2.0
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C which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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C
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C In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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C virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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C
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C
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C
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C Fortran 77 Implementation: iterator_fortran
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C
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C Description: how to use an iterator on lat/lon/values.
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C
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C
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C
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C
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C
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program iterator
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implicit none
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include 'grib_api_fortran.h'
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integer ifile
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integer iret,iter
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real*8 lat,lon,value,missingValue
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integer n,flags
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character*256 filename
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character*256 error
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C Message identifier.
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integer igrib
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ifile=5
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call grib_check(grib_open_file(ifile,
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X'../data/regular_latlon_surface.grib1','r'))
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C Loop on all the messages in a file.
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10 iret=grib_new_from_file(ifile,igrib)
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if (igrib .eq. -1 ) then
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if (iret .ne.0) then
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call grib_check(iret)
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endif
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stop
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endif
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C get as a real8
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call grib_check(grib_get_real8(igrib
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X,'missingValue',missingValue))
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write(*,*) 'missingValue=',missingValue
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C 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_check(grib_iterator_new(igrib,iter,flags))
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n = 0
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C Loop on all the lat/lon/values.
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20 iret = grib_iterator_next(iter,lat,lon,value)
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if ( iret .eq. 0 ) goto 30
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C You can now print lat and lon,
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if ( value .eq. missingValue ) then
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C 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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C 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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goto 20
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30 continue
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C At the end the iterator is deleted to free memory.
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call grib_check(grib_iterator_delete(iter))
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goto 10
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call grib_check(grib_release(igrib))
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call grib_check(grib_close_file(ifile))
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end
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