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michaesp |
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PROGRAM geo2rot
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c ***********************************************************************
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c * Rotate lat/lon coordinates *
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c * Michael Sprenger / Spring, summer 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 Mode for geo2rot
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character*80 mode
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c Input and output format for trajectories (see iotra.f)
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character*80 inpfile ! Input filename
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character*80 outfile ! Output filename
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c Trajectories
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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 (:,:,:) :: tra ! 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 Pole position
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real pollon ! Rotated pole longitude
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real pollat ! Rotated pole latitude
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c Auxiliary variables
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integer inpmode
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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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real lat,lon,rlat,rlon
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c Numerical epsilon
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real eps
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parameter (eps=0.0001)
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c Externals
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real lmtolms
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real phtophs
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real lmstolm
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real phstoph
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external lmtolms,phtophs
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external lmstolm,phstoph
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c ----------------------------------------------------------------------
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c Read parameters
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c ----------------------------------------------------------------------
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c Read parameters
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open(10,file='geo2rot.param')
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read(10,*) mode
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if ( mode.eq.'trajectory' ) then
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read(10,*) inpfile
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read(10,*) outfile
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read(10,*) ntra,ntim,ncol
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elseif ( mode.eq.'position' ) then
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read(10,*) lon
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read(10,*) lat
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endif
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read(10,*) pollon,pollat
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close(10)
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c ----------------------------------------------------------------------
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c Rotate a single position
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c ----------------------------------------------------------------------
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if ( mode.ne.'position') goto 100
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if ( abs(pollat-90.).gt.eps) then
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rlon = lmtolms(lat,lon,pollat,pollon)
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rlat = phtophs(lat,lon,pollat,pollon)
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else
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rlon = lon
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rlat = lat
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endif
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print*,rlon,rlat
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100 continue
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c ----------------------------------------------------------------------
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c Rotate a trajectory file
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c ----------------------------------------------------------------------
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if ( mode.ne.'trajectory') goto 200
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c Determine the formats
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call mode_tra(inpmode,inpfile)
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if (inpmode.eq.-1) inpmode=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 Allocate memory
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allocate(tra(ntra,ntim,ncol),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array tra ***'
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c Read inpufile
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call ropen_tra(fid,inpfile,ntra,ntim,ncol,refdate,vars,inpmode)
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call read_tra (fid,tra,ntra,ntim,ncol,inpmode)
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call close_tra(fid,inpmode)
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c Do the coordinate rotation
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do i=1,ntra
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do j=1,ntim
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lon = tra(i,j,2)
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lat = tra(i,j,3)
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if ( abs(pollat-90.).gt.eps) then
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rlon = lmtolms(lat,lon,pollat,pollon)
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rlat = phtophs(lat,lon,pollat,pollon)
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else
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rlon = lon
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rlat = lat
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endif
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tra(i,j,2) = rlon
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tra(i,j,3) = rlat
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enddo
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enddo
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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,tra,ntra,ntim,ncol,outmode)
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call close_tra(fid,outmode)
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200 continue
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end
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