To: atm{at}shore.net
From: Jim Burrows 
Reply-To: Jim Burrows 


At 13:14 2003-07-04 -0500, Michael Peck wrote:

>s_m ~= sqrt [ (.03)^2 + (.7/4F)^2 * 2^2 ] ~= sqrt [ (.03)^2 + (.04)^2 *
>2^2 ] ~ 0.084 mm
>
>This is just a back of the envelope calculation but it's within 10% or so
>of what my models return. What it says is the dominant source of random
>errors in your data isn't your Foucault readings but instead is the
>limited spatial resolution of your images.

I've always had the intuitive suspicion that zone radii errors were
Robo-Foucault's Achilles' heel.  I think the above result also yells
PINSTICK or maybe even  a MASK to fix the zone radii instead
of fiddling with center estimates, edge circles, and pixel balancing.

         -- Jim Burrows
         -- mailto://burrjaw{at}earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)

--- BBBS/NT v4.01 Flag-4