mirror of https://github.com/ecmwf/eccodes.git
97 lines
2.7 KiB
Fortran
97 lines
2.7 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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!
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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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endif
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enddo
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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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