mirror of https://github.com/ecmwf/eccodes.git
81 lines
2.3 KiB
Fortran
81 lines
2.3 KiB
Fortran
! Copyright 2005-2015 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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!
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! Description: how to set a bitmap in a grib message
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!
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!
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!
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program set_bitmap
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use eccodes
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implicit none
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integer :: infile,outfile
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integer :: igrib, iret
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integer :: numberOfValues
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real, dimension(:), allocatable :: values
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real :: missingValue
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logical :: grib1Example
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grib1Example=.true.
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if (grib1Example) then
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! GRIB 1 example
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call codes_open_file(infile,'../../data/regular_latlon_surface.grib1','r')
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else
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! GRIB 2 example
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call codes_open_file(infile,'../../data/regular_latlon_surface.grib2','r')
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end if
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call codes_open_file(outfile,'out.bmp.grib','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)
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! The missingValue is not coded in the message.
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! It is a value we define as a placeholder for a missing value
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! in a point of the grid.
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! It should be choosen in a way that it cannot be confused
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! with a valid field value
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missingValue=9999
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call codes_set(igrib, 'missingValue',missingValue)
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write(*,*) 'missingValue=',missingValue
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! get the size of the values array
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call codes_get_size(igrib,'values',numberOfValues)
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write(*,*) 'numberOfValues=',numberOfValues
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allocate(values(numberOfValues), stat=iret)
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! get data values
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call codes_get(igrib,'values',values)
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! enable bitmap
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call codes_set(igrib,"bitmapPresent",1)
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! some values are missing
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values(1:10) = missingValue
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! set the values (the bitmap will be automatically built)
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call codes_set(igrib,'values', values)
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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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call codes_close_file(infile)
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call codes_close_file(outfile)
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deallocate(values)
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end program set_bitmap
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