mirror of https://github.com/ecmwf/eccodes.git
99 lines
3.2 KiB
Fortran
99 lines
3.2 KiB
Fortran
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!
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!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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! FOTRAN 90 Implementation: bufr_read_scatterometer
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!
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! Description: how to read data for a given beam from scatterometer BUFR messages.
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!
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! Please note that scatterometer data can be encoded in various ways in BUFR. Therefore the code
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! below might not work directly for other types of messages than the one used in the
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! example. It is advised to use bufr_dump first to understand the structure of these messages.
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program bufr_read_scatterometer
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use eccodes
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implicit none
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integer :: ifile
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integer :: iret
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integer :: ibufr
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integer :: i, count=0
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integer(kind=4) :: numObs
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real(kind=8), dimension(:), allocatable :: latVal,lonVal,bscatterVal
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call codes_open_file(ifile,'../../data/bufr/asca_139.bufr','r')
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! the first bufr message is loaded from file
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! ibufr is the bufr id to be used in subsequent calls
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call codes_bufr_new_from_file(ifile,ibufr,iret)
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do while (iret/=CODES_END_OF_FILE)
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write(*,*) 'message: ',count
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! we need to instruct ecCodes to expand all the descriptors
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! i.e. unpack the data values
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call codes_set(ibufr,"unpack",1);
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! The BUFR file contains a single message with 2016 subsets in a compressed form.
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! It means each subset has exactly the same structure: they store one location with
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! several beams and one backscatter value in each beam.
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!
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! To print the backScatter values for beamIdentifier=2 from all the subsets
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! we will simply access the key by condition (see below).
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! Read the total number of subsets.
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call codes_get(ibufr,'numberOfSubsets',numObs)
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write(*,*) "Number of values:",numObs
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!Get latitude (for all the subsets)
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call codes_get(ibufr,'latitude',latVal);
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!Get longitude (for all the subsets)
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call codes_get(ibufr,'latitude',lonVal);
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!Get backScatter for beam two. We use an access by condition for this key.
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!(for all the subsets)
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call codes_get(ibufr,'/beamIdentifier=2/backscatter',bscatterVal);
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! ---- Check that all arrays are same size
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if (size(latVal)/= numObs .or. size(lonVal)/= numObs .or. size(bscatterVal)/= numObs) then
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print *,'inconsistent array dimension'
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exit
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endif
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! ---- Print the values --------------------------------
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write(*,*) 'pixel lat lon backscatter'
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write(*,*) "--------------------------------------"
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do i=1,numObs
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write(*,*) i,latVal(i),lonVal(i),bscatterVal(i)
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end do
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! free arrays
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deallocate(latVal)
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deallocate(lonVal)
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deallocate(bscatterVal)
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! release the bufr message
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call codes_release(ibufr)
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! load the next bufr message
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call codes_bufr_new_from_file(ifile,ibufr,iret)
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count=count+1
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end do
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! close file
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call codes_close_file(ifile)
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end program bufr_read_scatterometer
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