mirror of https://github.com/ecmwf/eccodes.git
74 lines
2.4 KiB
Fortran
74 lines
2.4 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 create a new GRIB message by cloning
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! an existing message.
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!
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!
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program clone
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use eccodes
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implicit none
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integer :: err, i
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integer :: nx, ny
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integer :: infile, outfile
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integer :: igrib_in
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integer :: igrib_out
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character(len=2) :: step
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real(kind=8), dimension(:, :), allocatable :: field2D
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call codes_open_file(infile, '../../data/constant_field.grib1', 'r')
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call codes_open_file(outfile, 'out.clone.grib1', 'w')
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! A new GRIB message is loaded from file.
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! igrib is the GRIB id to be used in subsequent calls
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call codes_grib_new_from_file(infile, igrib_in)
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call codes_get(igrib_in, 'Ni', nx)
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call codes_get(igrib_in, 'Nj', ny)
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allocate (field2D(nx, ny), stat=err)
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if (err .ne. 0) then
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print *, 'Failed to allocate ', nx*ny, ' values'
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STOP
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end if
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! clone the constant field to create 4 new GRIB messages
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do i = 0, 18, 6
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call codes_clone(igrib_in, igrib_out)
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write (step, '(i2)') i
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! Careful: stepRange is a string (could be 0-6, 12-24, etc.)
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! use adjustl to remove blank from the left.
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call codes_set(igrib_out, 'stepRange', adjustl(step))
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call generate_field(field2D)
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! use pack to create 1D values
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call codes_set(igrib_out, 'values', pack(field2D, mask=.true.))
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! write cloned messages to a file
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call codes_write(igrib_out, outfile)
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call codes_release(igrib_out)
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end do
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call codes_release(igrib_in)
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call codes_close_file(infile)
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call codes_close_file(outfile)
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deallocate (field2D)
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contains
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!======================================
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subroutine generate_field(gfield2D)
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real(kind=8), dimension(:, :) :: gfield2D
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call random_number(gfield2D)
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end subroutine generate_field
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!======================================
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end program clone
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