[Vis5d-users] trajectory computation (how?)

greetings:

i have having trouble with the wind trajectories.

in this case, the variables are U,V, and W and these
are for ocean current components. the problem is that
when the instructions for creating trajectories are followed,
the only thing that appears is a single dot and this is the
dot created with the 2nd mouse click.

the example LAMPS.v5d that is included with the distribution
works fine, though.


the manual(4.2 page 18) says 

"For the purposes of calculating wind trajectories, Vis5D assumes
the relationship between height (H) and pressure (P) is:

P = 1012.5*e^(H/-7.2)
H = -7.2*Ln(P/1012.5)



QUESTION: do we need a pressure array of values, or
does vis5d take the height values implied below, compute
a pressure function and then create the trajectories based on
the pressure values?

the vis5d file is created with:

 v5dCreateSimple(...,northlat,latinc,westlon,loninc,bottomhgt,hgtinc)
vd5CreateSimple(..., 37.104,  0.0020, 76.134,  0.0025, -0.0500,  0.0050)

here are the heights:

    h (km)
 1  0.
 2 -0.005
 3 -0.01
 4 -0.015
 5 -0.02
 6 -0.025
 7 -0.03
 8 -0.035
 9 -0.04
10 -0.045
11 -0.05

using the formula for pressure above, one sees that the pressure
only changes by 4 units from top to bottom.

any help would be appreciated.



m. r. schaferkotter
Sverdrup Technology, Inc
Bldg. 1007, NRL
Stennis Space Center, MS 39529
(228) 688-5619
sch...@te...