mirror of https://github.com/ecmwf/eccodes.git
73 lines
2.0 KiB
Fortran
73 lines
2.0 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 set pv values in a GRIB message
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!
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!
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program grib_set_pv
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use eccodes
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implicit none
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integer :: numberOfLevels
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integer :: numberOfCoefficients
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integer :: outfile, igrib
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integer :: i, ios
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real, dimension(:), allocatable :: pv
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numberOfLevels = 60
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numberOfCoefficients = 2*(numberOfLevels + 1)
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allocate (pv(numberOfCoefficients))
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! read the model level coefficients from file
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open (unit=1, file="../../data/60_model_levels", &
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form="formatted", action="read")
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do i = 1, numberOfCoefficients, 2
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read (unit=1, fmt=*, iostat=ios) pv(i), pv(i + 1)
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if (ios /= 0) then
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print *, "I/O error: ", ios
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exit
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end if
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end do
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! print coefficients
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!do i=1,numberOfCoefficients,2
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! print *," a=",pv(i)," b=",pv(i+1)
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!end do
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close (unit=1)
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call codes_open_file(outfile, 'out.pv.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_samples(igrib, "reduced_gg_sfc_grib1")
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! set levtype to ml (model level)
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call codes_set(igrib, 'typeOfLevel', 'hybrid')
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! set level
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call codes_set(igrib, 'level', 2)
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! set PVPresent as an integer
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call codes_set(igrib, 'PVPresent', 1)
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call codes_set(igrib, 'pv', pv)
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! write modified message to a file
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call codes_write(igrib, outfile)
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! free memory
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call codes_release(igrib)
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deallocate (pv)
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call codes_close_file(outfile)
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end program grib_set_pv
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