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michaesp |
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PROGRAM difference
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c ***********************************************************************
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c * Get the difference between tow trajectory files *
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c * Michael Sprenger / Spring, summer, autumn 2010 *
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c ***********************************************************************
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implicit none
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c ----------------------------------------------------------------------
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c Declaration of variables
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c ----------------------------------------------------------------------
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c Field name and mode for difference calculation
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character*80 mode ! Difference mode
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character*80 fieldname ! Name of differencing
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c Input and output format for trajectories (see iotra.f)
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character*80 inpfile1 ! Input filename 1
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character*80 inpfile2 ! Input filename 2
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character*80 outfile ! Output filename
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c Input trajectories
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integer ntra1 ,ntra2 ! Number of trajectories
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integer ntim1 ,ntim2 ! Number of times
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integer ncol1 ,ncol2 ! Number of columns
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real,allocatable, dimension (:,:,:) :: trainp1 ,trainp2 ! Trajectories (ntra,ntim,ncol)
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character*80 vars1(100) ,vars2(100) ! Variable names
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integer refdate1(6),refdate2(6) ! Reference date
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c Output/comparison trajectory
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integer ntra ! Number of trajectories
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integer ntim ! Number of times
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integer ncol ! Number of columns
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real,allocatable, dimension (:,:,:) :: traout ! Trajectories (ntra,ntim,ncol)
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character*80 vars(100) ! Variable names
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integer refdate(6) ! Reference date
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c Auxiliary variables
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integer inpmode1,inpmode2
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integer outmode
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integer stat
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integer fid
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integer i,j,k
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integer ind1,ind2
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integer isok
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character ch
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real,allocatable, dimension (:) :: diff
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integer outind
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c Externals
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real,external :: sdis
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c ----------------------------------------------------------------------
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c Preparations
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c ----------------------------------------------------------------------
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c Read parameters
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open(10,file='difference.param')
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read(10,*) inpfile1
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read(10,*) inpfile2
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read(10,*) outfile
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read(10,*) ntra1,ntim1,ncol1
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read(10,*) ntra2,ntim2,ncol2
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read(10,*) mode
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read(10,*) fieldname
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close(10)
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c Determine the formats
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call mode_tra(inpmode1,inpfile1)
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if (inpmode1.eq.-1) inpmode1=1
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call mode_tra(inpmode2,inpfile2)
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if (inpmode2.eq.-1) inpmode2=1
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call mode_tra(outmode,outfile)
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if (outmode.eq.-1) outmode=1
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c Set number of trajectories for output
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if ( ntra1.lt.ntra2) then
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ntra = ntra1
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else
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ntra = ntra2
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endif
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c Set number of times for output
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if ( mode.eq.'single' ) then
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ntim = ntim1
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else
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ntim = 1
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endif
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c Set the column names for output
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if ( fieldname.eq.'LATLON') then
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ncol = 1 + 3 + 3 + 1
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vars(1) = 'time'
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vars(2) = 'lon[1]'
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vars(3) = 'lat[1]'
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vars(4) = 'p[1]'
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vars(5) = 'lon[2]'
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vars(6) = 'lat[2]'
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vars(7) = 'p[2]'
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vars(8) = 'SDIS'
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else
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ncol = 1 + 3 + 3 + 2 + 1
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vars( 1) = 'time'
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vars( 2) = 'lon[1]'
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vars( 3) = 'lat[1]'
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vars( 4) = 'p[1]'
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vars( 5) = 'lon[2]'
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vars( 6) = 'lat[2]'
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vars( 7) = 'p[2]'
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vars( 8) = trim(fieldname)//'[1]'
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vars( 9) = trim(fieldname)//'[2]'
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vars(10) = trim(fieldname)//'[1-2]'
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endif
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c Allocate memory
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allocate(trainp1(ntra1,ntim1,ncol1),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array trainp1 ***'
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allocate(trainp2(ntra2,ntim2,ncol2),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array trainp2 ***'
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allocate(traout(ntra,ntim,ncol),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array traout ***'
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allocate(diff(ntim1),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array diff ***'
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c Read inpufiles
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call ropen_tra(fid,inpfile1,ntra1,ntim1,ncol1,
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> refdate1,vars1,inpmode1)
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call read_tra (fid,trainp1,ntra1,ntim1,ncol1,inpmode1)
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call close_tra(fid,inpmode1)
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call ropen_tra(fid,inpfile2,ntra2,ntim2,ncol2,
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> refdate2,vars2,inpmode2)
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call read_tra (fid,trainp2,ntra2,ntim2,ncol2,inpmode2)
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call close_tra(fid,inpmode2)
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c Check dimensions of the two trajectory files (#tim hard check)
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if (ntim1.ne.ntim2) then
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print*,'Trajectoy files have different time dimensions... Stop'
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stop
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endif
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c Check dimensions of the two trajectory files (#tra soft check)
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if (ntra1.ne.ntra2) then
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print*,'Differing number of trajectories... proceed [y/n]'
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read*,ch
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if (ch.eq.'n') stop
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endif
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c Check whether difference field is available on both files
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if ( fieldname.ne.'LATLON') then
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ind1 = 0
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ind2 = 0
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do i=1,ncol
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if ( fieldname.eq.vars1(i) ) ind1 = i
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if ( fieldname.eq.vars2(i) ) ind2 = i
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enddo
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if ( (ind1.eq.0).or.(ind2.eq.0) ) then
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print*,'Field ',trim(fieldname),' not available... Stop'
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stop
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endif
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endif
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c Check reference dates (soft check)
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isok = 1
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do i=1,6
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if ( refdate1(i).ne.refdate2(i) ) isok = 0
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enddo
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if ( isok.eq.0 ) then
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print*,'Warning: reference dates differ... proceed [y/n]'
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read*,ch
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if (ch.eq.'n') stop
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endif
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c Check trajectory times (soft check)
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isok = 1
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do i=1,ntim
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if ( trainp1(1,i,1).ne.trainp2(1,i,1) ) isok = 0
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enddo
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if ( isok.eq.0 ) then
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print*,'Warning: trajectory times differ... proceed [y/n]'
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read*,ch
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if (ch.eq.'n') stop
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endif
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c Copy reference date to output
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do i=1,6
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refdate(i) = refdate1(i)
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enddo
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c ----------------------------------------------------------------------
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c Calculate the difference (depending on mode)
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c ----------------------------------------------------------------------
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c Loop over all trajectories
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do i=1,ntra
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c Calculate difference for all times
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do j=1,ntim1
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c Calculate the difference (distance or absolute value)
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if (fieldname.eq.'LATLON') then
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diff(j) = sdis( trainp1(i,j,2),trainp1(i,j,3),
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> trainp2(i,j,2),trainp2(i,j,3) )
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else
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diff(j) = abs(trainp1(i,j,ind1) - trainp2(i,j,ind2))
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endif
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enddo
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c Save output for each time
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if ( mode.eq.'single' ) then
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do j=1,ntim
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if ( fieldname.eq.'LATLON' ) then
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traout(i,j, 1) = trainp1(i,j,1) ! time
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traout(i,j, 2) = trainp1(i,j,2) ! lon[1]
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traout(i,j, 3) = trainp1(i,j,3) ! lat[1]
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traout(i,j, 4) = trainp1(i,j,4) ! p[1]
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traout(i,j, 5) = trainp2(i,j,2) ! lon[2]
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traout(i,j, 6) = trainp2(i,j,3) ! lat[2]
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traout(i,j, 7) = trainp2(i,j,4) ! p[2]
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traout(i,j, 8) = diff(j) ! SDIS(j)
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else
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traout(i,j, 1) = trainp1(i,j,1) ! time
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traout(i,j, 2) = trainp1(i,j,2) ! lon[1]
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traout(i,j, 3) = trainp1(i,j,3) ! lat[1]
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traout(i,j, 4) = trainp1(i,j,4) ! p[1]
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traout(i,j, 5) = trainp2(i,j,2) ! lon[2]
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traout(i,j, 6) = trainp2(i,j,3) ! lat[2]
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traout(i,j, 7) = trainp2(i,j,4) ! p[2]
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traout(i,j, 8) = trainp1(i,j,ind1) ! field[1]
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traout(i,j, 9) = trainp2(i,j,ind2) ! field[2]
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traout(i,j,10) = diff(j) ! SDIS(j)
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endif
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enddo
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c Save only maximum
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elseif ( mode.eq.'max') then
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outind = 1
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do j=2,ntim1
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if ( diff(j).gt.diff(outind) ) outind = j
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enddo
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if ( fieldname.eq.'LATLON' ) then
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traout(i,1, 1) = trainp1(i,outind,1) ! time
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traout(i,1, 2) = trainp1(i,outind,2) ! lon[1]
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traout(i,1, 3) = trainp1(i,outind,3) ! lat[1]
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traout(i,1, 4) = trainp1(i,outind,4) ! p[1]
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traout(i,1, 5) = trainp2(i,outind,2) ! lon[2]
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traout(i,1, 6) = trainp2(i,outind,3) ! lat[2]
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traout(i,1, 7) = trainp2(i,outind,4) ! p[2]
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traout(i,1, 8) = diff(outind) ! SDIS
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else
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traout(i,1, 1) = trainp1(i,outind,1) ! time
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traout(i,1, 2) = trainp1(i,outind,2) ! lon[1]
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traout(i,1, 3) = trainp1(i,outind,3) ! lat[1]
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traout(i,1, 4) = trainp1(i,outind,4) ! p[1]
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traout(i,1, 5) = trainp2(i,outind,2) ! lon[2]
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traout(i,1, 6) = trainp2(i,outind,3) ! lat[2]
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traout(i,1, 7) = trainp2(i,outind,4) ! p[2]
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traout(i,1, 8) = trainp1(i,outind,ind1) ! field[1]
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traout(i,1, 9) = trainp2(i,outind,ind2) ! field[2]
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traout(i,1,10) = diff(outind) ! SDIS(j)
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endif
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endif
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enddo
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c ----------------------------------------------------------------------
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c Write output
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c ----------------------------------------------------------------------
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c Write output file
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call wopen_tra(fid,outfile,ntra,ntim,ncol,refdate,vars,outmode)
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call write_tra(fid,traout,ntra,ntim,ncol,outmode)
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call close_tra(fid,outmode)
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end
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c ***********************************************************************
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c * Subroutines *
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c ***********************************************************************
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c ----------------------------------------------------------------------
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c Spherical distance
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c ----------------------------------------------------------------------
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real function sdis(xp,yp,xq,yq)
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c
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c calculates spherical distance (in km) between two points given
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c by their spherical coordinates (xp,yp) and (xq,yq), respectively.
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c
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real pi180
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parameter (pi180=3.14159/180.)
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real re
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parameter (re=6370.)
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real degkm
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parameter (degkm=111.1775)
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real xp,yp,xq,yq,arg
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if ( (abs(xp-xq).gt.0.05).and.(abs(yp-yq).gt.0.05) ) then
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arg=sin(pi180*yp)*sin(pi180*yq)+
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> cos(pi180*yp)*cos(pi180*yq)*cos(pi180*(xp-xq))
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if (arg.lt.-1.) arg=-1.
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if (arg.gt.1.) arg=1.
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sdis=re*acos(arg)
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else
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sdis= (yp-yq)**2 + ( (xp-xq) * cos( pi180*0.5*(yp+yq) ) )**2
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sdis = deg2km * sqrt(sdis)
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endif
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end
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