[Xastir-Dev] Re: Xastir SAR feature added

[Owen DeLong]

What about a form that takes PLS, Vmin, Vmax, and TLS, Pdir, Cdir and
then tracks the probability arcs expanding/contracting them appropriately
with time.

Example/Explanation:

PLS	=	Point Last Seen
Vmin	=	Minimum anticipated speed
Vmax	=	Maximum anticipated speed
TLS	=	Time Last Seen (to compute likely position now from PLS
Pdir	=	Probable Direction of Travel
Cdir	=	Confidence in Pdir (expressed as degrees).  Larger number
		wider arc.  180 = full circle (+/- 180 degrees from Pdir)

This would allow you to input the above data about the subject, then, Xaster
could maintain a "track" on the possible/probable position of the subject
based on (Vmin+Vmax)/2 and draw a shaded search target area which would
update in real time.  The search target area would be bounded by the
Vmin arc, the Vmax arc, and straight lines between the corresponding edges
of the two arcs.  A third arc (the "likely position" arc) would be drawn
in the middle.  This way, the search area will grow (as it needs to) with
time, and, also move with the likely direction of travel of the subject.

The only real problem I see with this is that it would involve the 
assumption
that whatever direction the subject was moving they kept moving in that
direction.  It wouldn't allow, for example, for a subject wandering in
circles.

I think the behavior would be adequate for that with a 180 Cdir, but,
it would need some testing and such.  I am not a SAR expert, but, this
at least sounds like a good idea t me.

Owen