mirror of https://github.com/ecmwf/eccodes.git
96 lines
2.8 KiB
Fortran
96 lines
2.8 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 from a sample.
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!
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program sample
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use eccodes
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implicit none
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integer :: err
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integer :: outfile, datafile
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integer :: igribsample, igribclone, igribdata, size1
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integer :: date1, startStep, endStep, table2Version, indicatorOfParameter
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integer :: decimalPrecision
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character(len=10) stepType
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real(kind=8), dimension(:), allocatable :: v1, v2, v
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date1 = 20080104
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startStep = 0
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endStep = 12
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stepType = 'accum'
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table2Version = 2
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indicatorOfParameter = 61
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decimalPrecision = 2
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! A new GRIB message is loaded from an existing sample.
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! Samples are searched in a default sample path (use codes_info
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! to see where that is). The default sample path can be changed by
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! setting the environment variable ECCODES_SAMPLES_PATH
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call codes_grib_new_from_samples(igribsample, "regular_latlon_surface.grib1")
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call codes_open_file(outfile, 'f_out.samples.grib1', 'w')
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call codes_open_file(datafile, '../../data/tp_ecmwf.grib', 'r')
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call codes_grib_new_from_file(datafile, igribdata, err)
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call codes_get_size(igribdata, 'values', size1)
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allocate (v(size1))
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allocate (v1(size1))
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allocate (v2(size1))
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call codes_get(igribdata, 'values', v)
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v = v*1000.0 ! different units for the output grib
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v1 = v
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do while (err /= CODES_END_OF_FILE)
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call codes_clone(igribsample, igribclone) ! clone sample before modifying it
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call codes_set(igribclone, 'dataDate', date1)
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call codes_set(igribclone, 'table2Version', table2Version)
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call codes_set(igribclone, 'indicatorOfParameter', indicatorOfParameter)
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call codes_set(igribclone, 'stepType', stepType)
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call codes_set(igribclone, 'startStep', startStep)
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call codes_set(igribclone, 'endStep', endStep)
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call codes_set(igribclone, 'decimalPrecision', decimalPrecision)
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call codes_set(igribclone, 'values', v)
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call codes_write(igribclone, outfile)
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call codes_grib_new_from_file(datafile, igribdata, err)
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if (err == 0) then
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call codes_get(igribdata, 'values', v2)
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v2 = v2*1000.0 ! different units for the output grib
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v = v2 - v1 ! accumulation from startStep to endStep
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v1 = v2 ! save previous step field
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startStep = startStep + 12
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endStep = endStep + 12
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end if
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end do
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call codes_release(igribsample)
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deallocate (v)
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deallocate (v1)
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deallocate (v2)
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call codes_close_file(outfile)
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end program sample
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