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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.
!
!
! FORTRAN 90 Implementation: bufr_read_tropical_cyclone
!
! Description: how to read data for a tropical cyclone BUFR message.
!
! Please note that tropical cyclone tracks can be encoded in various ways in BUFR.
! Therefore the code below might not work directly for other types of messages
! than the one used in the example. It is advised to use bufr_dump to
! understand the structure of the messages.
!
program bufr_read_tropical_cyclone
use eccodes
implicit none
integer :: ifile
integer :: iret
integer :: ibufr,skipMember
integer :: significance
integer :: year,month,day,hour,minute
integer :: i,j,k,ierr,count=1
integer :: rankPosition,rankSignificance,rankPressure,rankWind
integer :: rankPeriod,numberOfPeriods
real(kind=8) :: latitudeCentre,longitudeCentre
real(kind=8), dimension(:), allocatable :: latitudeMaxWind0,longitudeMaxWind0,windMaxWind0
real(kind=8), dimension(:), allocatable :: latitudeAnalysis,longitudeAnalysis,pressureAnalysis
real(kind=8), dimension(:,:), allocatable :: latitude,longitude,pressure
real(kind=8), dimension(:,:), allocatable :: latitudeWind,longitudeWind,wind
integer(kind=4), dimension(:), allocatable :: memberNumber,period
real(kind=8), dimension(:), allocatable :: values
integer(kind=4), dimension(:), allocatable :: ivalues
character(len=8) :: rankSignificanceStr,rankPositionStr,rankPressureStr,rankWindStr
character(len=8) :: stormIdentifier,rankPeriodStr
call codes_open_file(ifile,'../../data/bufr/tropical_cyclone.bufr','r')
! The first BUFR message is loaded from file.
! ibufr is the BUFR id to be used in subsequent calls
call codes_bufr_new_from_file(ifile,ibufr,iret)
do while (iret/=CODES_END_OF_FILE)
write(*,'(A,I3,A)') '**************** MESSAGE: ',count,' *****************'
! We need to instruct ecCodes to unpack the data values
call codes_set(ibufr,"unpack",1);
call codes_get(ibufr,'year',year);
call codes_get(ibufr,'month',month);
call codes_get(ibufr,'day',day);
call codes_get(ibufr,'hour',hour);
call codes_get(ibufr,'minute',minute);
write(*,'(A,I0,A,I0,A,I0,A,I0,A,I0,A,I0)')'Date and time: ',day,'.',month,'.',year,' ',hour,':',minute
call codes_get(ibufr,'stormIdentifier',stormIdentifier)
write(*,'(A,A)')'Storm identifier: ',stormIdentifier
! How many different timePeriod in the data structure?
rankPeriod=0
ierr=0
do while(ierr==0)
rankPeriod=rankPeriod+1
write (rankPeriodStr,'(I0)')rankPeriod
call codes_get(ibufr,'#'//trim(rankPeriodStr)//'#timePeriod',period,ierr)
if(allocated(period)) deallocate(period)
enddo
! The numberOfPeriods includes the analysis (period=0)
numberOfPeriods=rankPeriod
call codes_get(ibufr,'ensembleMemberNumber',memberNumber)
allocate(latitude(size(memberNumber),numberOfPeriods))
allocate(longitude(size(memberNumber),numberOfPeriods))
allocate(pressure(size(memberNumber),numberOfPeriods))
allocate(latitudeWind(size(memberNumber),numberOfPeriods))
allocate(longitudeWind(size(memberNumber),numberOfPeriods))
allocate(wind(size(memberNumber),numberOfPeriods))
allocate(values(size(memberNumber)))
allocate(period(numberOfPeriods))
period(1)=0
! Observed Storm Centre
call codes_get(ibufr,'#1#meteorologicalAttributeSignificance',significance);
call codes_get(ibufr,'#1#latitude',latitudeCentre);
call codes_get(ibufr,'#1#longitude',longitudeCentre);
if (significance/=1) then
print *,'ERROR: unexpected #1#meteorologicalAttributeSignificance'
stop 1
endif
if (latitudeCentre==CODES_MISSING_DOUBLE .and. longitudeCentre==CODES_MISSING_DOUBLE) then
write(*,'(a)')'Observed storm centre position missing'
else
write(*,'(A,F8.2,A,F8.2)')'Observed storm centre: latitude=',latitudeCentre,' longitude=',longitudeCentre
endif
! Location of storm in perturbed analysis
call codes_get(ibufr,'#2#meteorologicalAttributeSignificance',significance);
call codes_get(ibufr,'#2#latitude',latitudeAnalysis);
call codes_get(ibufr,'#2#longitude',longitudeAnalysis);
call codes_get(ibufr,'#1#pressureReducedToMeanSeaLevel',pressureAnalysis);
if (significance/=4) then
print *,'ERROR: unexpected #2#meteorologicalAttributeSignificance'
stop 1
endif
if (size(latitudeAnalysis)==size(memberNumber)) then
latitude(:,1)=latitudeAnalysis
longitude(:,1)=longitudeAnalysis
pressure(:,1)=pressureAnalysis
else
latitude(:,1)=latitudeAnalysis(1)
longitude(:,1)=longitudeAnalysis(1)
pressure(:,1)=pressureAnalysis(1)
endif
! Location of Maximum Wind
call codes_get(ibufr,'#3#meteorologicalAttributeSignificance',significance);
call codes_get(ibufr,'#3#latitude',latitudeMaxWind0);
call codes_get(ibufr,'#3#longitude',longitudeMaxWind0);
if (significance/=3) then
print *,'ERROR: unexpected #3#meteorologicalAttributeSignificance=',significance
stop 1
endif
call codes_get(ibufr,'#1#windSpeedAt10M',windMaxWind0);
if (size(latitudeMaxWind0)==size(memberNumber)) then
latitudeWind(:,1)=latitudeMaxWind0
longitudeWind(:,1)=longitudeMaxWind0
wind(:,1)=windMaxWind0
else
latitudeWind(:,1)=latitudeMaxWind0(1)
longitudeWind(:,1)=longitudeMaxWind0(1)
wind(:,1)=windMaxWind0(1)
endif
rankSignificance=3
rankPosition=3
rankPressure=1
rankWind=1
rankPeriod=0
! Loop on all periods excluding analysis period(1)=0
do i=2,numberOfPeriods
rankPeriod=rankPeriod+1
write (rankPeriodStr,'(I0)')rankPeriod
call codes_get(ibufr,'#'//trim(rankPeriodStr)//'#timePeriod',ivalues);
do k=1,size(ivalues)
if (ivalues(k)/=CODES_MISSING_LONG) then
period(i)=ivalues(k)
exit
endif
enddo
deallocate(ivalues)
! Location of the storm
rankSignificance=rankSignificance+1
write (rankSignificanceStr,'(I0)')rankSignificance
call codes_get(ibufr,'#'//trim(rankSignificanceStr)//'#meteorologicalAttributeSignificance',ivalues);
do k=1,size(ivalues)
if (ivalues(k)/=CODES_MISSING_LONG) then
significance=ivalues(k)
exit
endif
enddo
deallocate(ivalues)
rankPosition=rankPosition+1
write (rankPositionStr,'(I0)')rankPosition
call codes_get(ibufr,'#'//trim(rankPositionStr)//'#latitude',values);
latitude(:,i)=values
call codes_get(ibufr,'#'//trim(rankPositionStr)//'#longitude',values);
longitude(:,i)=values
if (significance==1) then
rankPressure=rankPressure+1
write (rankPressureStr,'(I0)')rankPressure
call codes_get(ibufr,'#'//trim(rankPressureStr)//'#pressureReducedToMeanSeaLevel',values);
pressure(:,i)=values
else
print *,'ERROR: unexpected meteorologicalAttributeSignificance=',significance
stop 1
endif
! Location of maximum wind
rankSignificance=rankSignificance+1
write (rankSignificanceStr,'(I0)')rankSignificance
call codes_get(ibufr,'#'//trim(rankSignificanceStr)//'#meteorologicalAttributeSignificance',ivalues);
do k=1,size(ivalues)
if (ivalues(k)/=CODES_MISSING_LONG) then
significance=ivalues(k)
exit
endif
enddo
deallocate(ivalues)
rankPosition=rankPosition+1
write (rankPositionStr,'(I0)')rankPosition
call codes_get(ibufr,'#'//trim(rankPositionStr)//'#latitude',values);
latitudeWind(:,i)=values
call codes_get(ibufr,'#'//trim(rankPositionStr)//'#longitude',values);
longitudeWind(:,i)=values
if (significance==3) then
rankWind=rankWind+1
write (rankWindStr,'(I0)')rankWind
call codes_get(ibufr,'#'//trim(rankWindStr)//'#windSpeedAt10M',values);
wind(:,i)=values
else
print *,'ERROR: unexpected meteorologicalAttributeSignificance=,',significance
stop 1
endif
enddo
! Print the values
do i=1,size(memberNumber)
skipMember=1
do j=1,size(period)
if (latitude(i,j)/=CODES_MISSING_DOUBLE .OR. latitudeWind(i,j)/=CODES_MISSING_DOUBLE) then
skipMember=0
exit
endif
enddo
if (skipMember/=1) then
write(*,'(A,I3)') '== Member ',memberNumber(i)
write(*,*) 'step latitude longitude pressure latitude longitude wind'
do j=1,size(period)
if (latitude(i,j)/=CODES_MISSING_DOUBLE .OR. latitudeWind(i,j)/=CODES_MISSING_DOUBLE) then
write(*,'( I4,2X,F8.2,4X,F8.2,3X,F9.1,2X,F8.2,4X,F8.2,2X,F8.2)') period(j),latitude(i,j),longitude(i,j),pressure(i,j),&
&latitudeWind(i,j),longitudeWind(i,j),wind(i,j)
endif
enddo
endif
enddo
! deallocating the arrays is very important
! because the behaviour of the codes_get functions is as follows:
! if the array is not allocated then allocate
! if the array is already allocated only copy the values
deallocate(values)
deallocate(latitude)
deallocate(longitude)
deallocate(pressure)
deallocate(latitudeWind)
deallocate(longitudeWind)
deallocate(wind)
deallocate(period)
deallocate(latitudeAnalysis)
deallocate(longitudeAnalysis)
deallocate(pressureAnalysis)
deallocate(memberNumber)
deallocate(latitudeMaxWind0)
deallocate(longitudeMaxWind0)
deallocate(windMaxWind0)
! Release the BUFR message
call codes_release(ibufr)
! Load the next BUFR message
call codes_bufr_new_from_file(ifile,ibufr,iret)
count=count+1
end do
! Close file
call codes_close_file(ifile)
end program bufr_read_tropical_cyclone
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