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michaesp |
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PROGRAM reformat
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c ***********************************************************************
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c * Change format of a trajectory file *
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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
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character*80 mode
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c Input and output files
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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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real,allocatable, dimension (:) :: num ! Output number
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c Auxiliary variables
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integer inpmode
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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 dist
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real lon0,lat0,lon1,lat1
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c Externals
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real sdis
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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='traj2num.param')
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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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read(10,*) mode
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close(10)
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c Check that a valid mode is selected
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if ( mode.eq.'boost' ) goto 10
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print*,' Unknown mode ',trim(mode)
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stop
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10 continue
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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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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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allocate(num(ntra),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array num ***'
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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 ----------------------------------------------------------------------
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c Mode = 'boost': get the maximum distance traveled in one time step
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c ----------------------------------------------------------------------
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if ( mode.ne.'boost') goto 100
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do i=1,ntra
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num(i) = 0.
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do j=2,ntim
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c Get spherical distance between data points
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lon0 = tra(i,j-1,2)
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lat0 = tra(i,j-1,3)
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lon1 = tra(i,j ,2)
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lat1 = tra(i,j ,3)
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dist = sdis( lon1,lat1,lon0,lat0 )
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if ( dist.gt.num(i) ) num(i) = dist
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enddo
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enddo
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100 continue
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c ----------------------------------------------------------------------
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c Write output file
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c ----------------------------------------------------------------------
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open(10,file=outfile)
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do i=1,ntra
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write(10,*) num(i)
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enddo
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close(10)
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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 between lat/lon points
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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 re
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parameter (re=6370.)
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real pi180
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parameter (pi180=3.14159/180.)
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real xp,yp,xq,yq,arg
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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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end
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