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! (C) Copyright 2005- ECMWF.
!
! This software is licensed under the terms of the Apache Licence Version 2.0
! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
!
! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
!
!
! Description: How to read SYNOP BUFR messages.
!
! Please note that SYNOP reports can be encoded in various ways in BUFR. Therefore the code
! below might not work directly for other types of SYNOP messages than the one used in the
! example. It is advised to use bufr_dump first to understand the structure of these messages.
!
program bufr_read_synop
use eccodes
implicit none
integer :: ifile
integer :: iret
integer :: ibufr
integer :: count = 0
integer(kind=4) :: blockNumber, stationNumber
real(kind=8) :: lat, t2m, td2m, ws, wdir
integer(kind=4) :: cloudAmount, cloudBaseHeight, lowCloud, midCloud, highCloud
call codes_open_file(ifile, '../../data/bufr/syno_multi.bufr', 'r')
do while (.true.)
call codes_bufr_new_from_file(ifile, ibufr, iret)
if (iret == CODES_END_OF_FILE) exit
write (*, *) 'message: ', count
! We need to instruct ecCodes to expand all the descriptors
! i.e. unpack the data values
call codes_set(ibufr, "unpack", 1)
!read and print some data values. This example was written
! for a SYNOP BUFR file!
! wmo block number
call codes_get(ibufr, 'blockNumber', blockNumber)
write (*, *) ' blockNumber:', blockNumber
! station number
call codes_get(ibufr, 'stationNumber', stationNumber)
write (*, *) ' stationNumber:', stationNumber
! location
call codes_get(ibufr, 'latitude', lat)
write (*, *) ' latitude:', lat
call codes_get(ibufr, 'longitude', lat)
write (*, *) ' longitude:', lat
! 2m temperature
call codes_get(ibufr, 'airTemperatureAt2M', t2m);
write (*, *) ' airTemperatureAt2M:', t2m
! 2m dewpoint temperature
call codes_get(ibufr, 'dewpointTemperatureAt2M', td2m);
write (*, *) ' dewpointTemperatureAt2M:', td2m
! 10m wind
call codes_get(ibufr, 'windSpeedAt10M', ws);
write (*, *) ' windSpeedAt10M:', ws
call codes_get(ibufr, 'windDirectionAt10M', wdir);
write (*, *) ' windDirectionAt10M:', wdir
! The cloud information is stored in several blocks in the
! SYNOP message and the same key means a different thing in different
! parts of the message. In this example we will read the first
! cloud block introduced by the key
! verticalSignificanceSurfaceObservations=1.
! We know that this is the first occurrence of the keys we want to
! read so we will use the # (occurrence) operator accordingly.
! Cloud amount (low and middleclouds)
call codes_get(ibufr, '#1#cloudAmount', cloudAmount)
write (*, *) ' cloudAmount (low and middle):', cloudAmount
! Height of cloud base
call codes_get(ibufr, '#1#heightOfBaseOfCloud', cloudBaseHeight)
write (*, *) ' heightOfBaseOfCloud:', cloudBaseHeight
! Cloud type (low clouds)
call codes_get(ibufr, '#1#cloudType', lowCloud)
write (*, *) ' cloudType (low):', lowCloud
! Cloud type (middle clouds)
call codes_get(ibufr, '#2#cloudType', midCloud)
write (*, *) ' cloudType (middle):', midCloud
! Cloud type (high clouds)
call codes_get(ibufr, '#3#cloudType', highCloud)
write (*, *) ' cloudType (high):', highCloud
! Release the bufr message
call codes_release(ibufr)
count = count + 1
end do
! Close file
call codes_close_file(ifile)
end program bufr_read_synop
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