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20050617: gptraj
- Subject: 20050617: gptraj
- Date: Fri, 17 Jun 2005 13:15:48 -0600
Clint,
I found this previously due to a support inquiry:
http://my.unidata.ucar.edu/cgi-bin/getfile?file=/content/support/help/MailArchives/gempak/msg03945.html
The fix is included in the next release (and subsequent downloads from May 6).
Chiz
>From: Clint Rowe <address@hidden>
>Organization: University of Nebraska Geosciences
>Keywords: 200506171807.j5HI79Zu019171
>
>--=-ZHZsC8ldWcetCjUqitAA
>Content-Type: text/plain
>Content-Transfer-Encoding: 7bit
>
>Chiz,
>I'm back to doing some backtrajectories and when I started using
>gptraj, all the arrows at the end of the trajectory ended up
>pointing south. I did a little sleuthing and discovered that
>the subroutine call to PD_DRCT had changed (one less argument), so
>the direction was always zero (South). I've attached the new
>version of ggtraj.f.
>Clint
>
>--
>====================================================================
>Clinton M. Rowe
>Associate Professor
>Meteorology/Climatology Program phone:(402)472-1946
>Department of Geosciences fax:(402)472-4917
>University of Nebraska-Lincoln address@hidden
>
>--=-ZHZsC8ldWcetCjUqitAA
>Content-Disposition: attachment; filename=ggtraj.f
>Content-Type: text/x-fortran; name=ggtraj.f; charset=
>Content-Transfer-Encoding: 7bit
>
> SUBROUTINE GGTRAJ(gdfile, gvect, gpoint, glevel, gvcord, gdattim,
> + tstep, marker, line, fbdir, title, shrttl, iret)
>C************************************************************************
>C* *
>C************************************************************************
> INCLUDE 'GEMPRM.PRM'
>C*
> PARAMETER ( MAXTRAJ = 1000 )
> CHARACTER*(*) gdfile, gpoint, glevel, gvcord, gdattim, marker,
> + line, gvect, title, shrttl, tstep
> CHARACTER ttlstr*(LLMXLN)
> CHARACTER timlst(LLMXGT)*20, pfunc*(LLMXLN), dattim(2)*20
> CHARACTER parmu*72, parmv*72
> REAL ugrd(LLMXGD), vgrd(LLMXGD), rloc(2)
> INTEGER level(2)
> CHARACTER*(LLMXLN) filnms(1), oldfil, templt
> CHARACTER*20 newgp(MAXTRAJ), startloc(MAXTRAJ)
> CHARACTER trange*40, startm*20, stoptm*20
> LOGICAL fbdir, prstop(MAXTRAJ)
> REAL clevl, plat(2), plon(2), rarri(3), rarrj(3)
>
> iret = 0
> oldfil = ' '
>C
>C* Get list of times in the desired time range for the grid file
>C
> CALL GR_FTIM ( gdfile, gdattim, timlst, ngdftm, trange, iret )
>C
> IF ( iret .ne. 0 ) THEN
> WRITE (*,*) 'Could not find timelist for ',gdfile, gdattim
> RETURN
> END IF
>C
>C* Check to see if at least 2 times exist for the trajectory
>C
> IF ( ngdftm .lt. 2) THEN
> WRITE (*,*) 'Error: GDATTIM must be a time range '
> RETURN
> END IF
>C
>C* Invert time list for back trajectory if needed
>C
> if(fbdir) then
> imul = -1
> do i=1,ngdftm/2
> dattim(1) = timlst(i)
> timlst(i) = timlst(ngdftm - i + 1)
> timlst(ngdftm - i + 1) = dattim(1)
> end do
> ELSE
> imul = 1
> END IF
>
> CALL IN_MARK(marker, mkcolr, ier)
> clevl = 1
> CALL IN_LINE(line, clevl, 1, icolor, itype, iwidth, ilabel,
> + smooth, filter, ier)
> CALL GSLINE (itype, 2, iwidth, 2, ier)
>
>C
>C* check to see if the user has entered a gpoint, or a lat/lon
>C* increment, eg 35/50/5;-120/-75/-5
>C
> ipnt = INDEX ( gpoint ( 1 : ) , '/' )
> IF ( ipnt .eq. 0 ) THEN
> newgp (1) = gpoint
> startloc (1) = gpoint
> numgp = 1
> ELSE
> ipnt = INDEX ( gpoint ( 1 : ) , ';' )
> IF ( ipnt .eq. 0 ) THEN
> WRITE (*,*) 'Error: invalid gpoint format ',gpoint
> RETURN
> END IF
> CALL ST_C2R ( gpoint ( 1 : ipnt - 1 ), 3, rarri, numi, ier )
> CALL ST_C2R ( gpoint ( ipnt + 1 : ), 3, rarrj, numj, ier )
> IF ( ( numi .ne. 3 ) .or. ( numj .ne. 3 ) ) THEN
> WRITE (*,*) 'Error parsing lat/lon/increment: ',gpoint
> RETURN
> END IF
> IF ( ( rarri (1) .gt. rarri (2) ) .or.
> + ( rarri (3) .le. 0 ) .or.
> + ( rarrj (1) .gt. rarrj (2) ) .or.
> + ( rarrj (3) .le. 0 ) ) THEN
> WRITE (*,*) 'Error specifying lat/lon/increment: ',gpoint
> RETURN
> END IF
>C
> numgp = 0
> rlat = rarri (1)
> DO WHILE ( rlat .le. rarri (2) )
> rlon = rarrj (1)
> DO WHILE ( ( rlon .le. rarrj (2) ) .and.
> + (numgp .lt. MAXTRAJ ) )
> rloc(1) = rlat
> rloc(2) = rlon
> numgp = numgp + 1
> CALL ST_LSTF (rloc, 2, ';', 5, newgp(numgp), ier)
> startloc(numgp) = newgp(numgp)
> prstop(numgp) = .false.
> rlon = rlon + rarrj (3)
> IF ( ( numgp .eq. MAXTRAJ ) .and.
> + ( rlon .le. rarrj (2) ) )
> + write(*,*) 'Warning: maximum trajectories is ',
> + MAXTRAJ
> END DO
> rlat = rlat + rarri (3)
> END DO
> END IF
>C
>C* Get time step if present, otherwise set to 1 minute
>C
> CALL ST_NUMB ( tstep, jinc, ier)
> IF ( ( ier .ne. 0 ) .or. ( jinc .le. 0 ) ) THEN
> jinc = 1
> END IF
>
> igdfln = -1
> iend = ngdftm-1
> DO i=1,iend
> CALL TG_VALD(timlst(i),startm,ier)
>
> CALL TG_VALD(timlst(i+1),stoptm,ier)
>
> CALL TI_DIFF(stoptm(1:11),startm(1:11),nmin,ier)
> write(*,*) 'start/stop/nmin ',startm,stoptm,nmin
> nmin = nmin * imul
>C
> newk = -1
> jend = nmin
> j = 0
> DO WHILE ( j .lt. jend )
>C
>C* Set rinc, the timestep for advection calculations
>C
> IF ( ( j + jinc ) .gt. jend ) THEN
> rinc = float ( jend - j )
> ELSE
> rinc = float ( jinc )
> END IF
>C
> IF ( j .lt. (nmin/2) ) THEN
> k = i
> ELSE
> k = i + 1
> END IF
>
> IF ( newk .ne. k ) THEN
>C
>C* Get actual file name for time/template
>C
> CALL FL_MFLS ( gdfile, timlst(k), ' ', 1, filnms,
> + nfiles, templt, ier)
>C
>C* Open a new grid file if necessary
>C
> IF ( filnms(1) .ne. oldfil ) THEN
>
> IF ( igdfln .gt. 0 ) CALL DG_CLOS ( igdfln, ier )
> CALL DG_OFIL ( filnms(1), ' ', .false., igdfln,
> + idum, iret )
> oldfil = filnms(1)
> END IF
>C
>C* Get the north relative U and V grids for GVECT
>C
> CALL DG_VECT(timlst(k), glevel, gvcord, gvect, pfunc,
> + ugrd, vgrd, kx, ky, dattim, level, ivcord,
> + parmu, parmv, iret)
> if(iret .ne. 0) then
> CALL ER_WMSG ( 'GPTRAJ', iret, pfunc, ier )
> if(i .eq. 1) RETURN
> END IF
> END IF
> newk = k
>C
>C* Find and plot the next location for each GPOINT
>C
> DO igp = 1, numgp
> IF ( .not. prstop(igp) ) THEN
>C
>C* Find plotting location.
>C
> CALL GR_PLOC ( newgp(igp), rgx, rgy, rlat, rlon,
> + iret )
> IF ( iret .ne. 0 ) THEN
> prstop (igp) = .true.
> CALL ER_WMSG ( 'GR', iret, newgp(igp), ier )
> END IF
> END IF
>
> IF ( .not. prstop(igp) ) THEN
>
> CALL GR_INTP(1,rgx,rgy,1,kx,ky,ugrd,ucomp,iret)
> CALL GR_INTP(1,rgx,rgy,1,kx,ky,vgrd,vcomp,iret)
>
> tinc = 60. * rinc
> plat (1) = rlat
> plon (1) = rlon
> rlon = rlon + ( (imul*ucomp * tinc)/(111111. *
> + cos(rlat*DTR) ) )
> rlat = rlat + (imul*vcomp * tinc)/111111.
> plat(2) = rlat
> plon(2) = rlon
>C
>C* Draw the line connecting old and new locations
>C
> CALL GSCOLR(icolor, ier)
> CALL GLINE('M', 2, plat, plon, ier)
>C
>C* Plot the marker at each available forecast time, if requested
>C
> IF ( ( j .eq. 0) .and. ( mkcolr .gt. 0 ) ) THEN
> CALL GSCOLR(mkcolr,ier)
> CALL GMARK('M',1,plat,plon,ier)
>C* Draw directional arrow at start of back traj
> IF ( fbdir .and. ( i .eq. 1 ) ) THEN
> CALL PD_DRCT (ucomp, vcomp, 1, dir, ier )
> CALL GSDARR (1., 1., 1, 1, ier)
> CALL GSCOLR(mkcolr, ier)
> CALL GDARR ('M', 1, plat, plon, dir, ier)
> END IF
> END IF
>C
> rloc(1) = rlat
> rloc(2) = rlon
> CALL ST_LSTF (rloc, 2, ';', 5, newgp(igp), ier)
>C
>C* Plot marker at end of trajectory
>C
> IF ( ( i .eq. iend ) .and. ( ( j + jinc ) .ge. jend )
> + .and. ( mkcolr .gt. 0 ) ) THEN
> CALL GSCOLR(mkcolr,ier)
> CALL GMARK('M',1,rlat,rlon,ier)
>C* Draw directional arrow at end if forward trajectory
> IF (.not. fbdir) THEN
> CALL PD_DRCT (ucomp, vcomp, 1, dir, ier )
> CALL GSDARR (1., 1., 1, 1, ier)
> CALL GSCOLR(mkcolr, ier)
> CALL GDARR ('M', 1, rlat, rlon, dir, ier)
> END IF
> END IF
> END IF
> END DO
> j = j + jinc
> END DO
>
> END DO
>
> DO igp = 1, numgp
> IF ( .not. fbdir ) THEN
> IF ( .not. prstop (igp ) ) THEN
> write(*,9990) 'Start Location:', startloc(igp),
> + 'Ending location', newgp(igp)
> ELSE
> write(*,9990) 'Start Location:', startloc(igp),
> + 'Terminated location ', newgp(igp)
> END IF
> ELSE
> IF ( .not. prstop (igp ) ) THEN
> write(*,9990) 'Ending Location:', startloc(igp),
> + 'Initial location', newgp(igp)
> ELSE
> write(*,9990) 'Ending Location:', startloc(igp),
> + 'Terminated location ', newgp(igp)
> END IF
> END IF
> END DO
>
>9990 FORMAT ( A, 1X, A, 1X, A, 1X, A )
>
>C
>C* write title
>C
> if(imul .eq. -1) then
> dattim(1) = timlst(ngdftm)
> dattim(2) = timlst(1)
> ELSE
> dattim(1) = timlst(1)
> dattim(2) = timlst(ngdftm)
> END IF
> CALL IN_TITL( title, 0, ititcol, linttl, ttlstr, ier )
> CALL GR_TITL ( ttlstr, dattim, .true., level,
> + ivcord, gvect(1:12), 0, gpoint,
> + ttlstr, shrttl, ier )
> IF ( ititcol .ne. 0 ) THEN
> CALL GSCOLR ( ititcol, ier )
> CALL GG_WSTR ( ttlstr, linttl, ier )
> END IF
>
> IF ( igdfln .gt. 0 ) CALL DG_CLOS ( igdfln, ier )
>
> RETURN
> END
>
>--=-ZHZsC8ldWcetCjUqitAA--
>
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