That graph exaggerates the amount of >g. The velocity graph is better because it can be compered to the NIST and Chandler graphs.
Well, you still don't get why the acceleration graph, which is mathematically derived from the S-G velocity funtion, is superior when discussiong the acceleration implicit to the S-G velocity graph, but never mind. You are not a math-person, I think *sigh*
[qimg]http://img515.imageshack.us/img515/2535/femr5e.jpg[/qimg]

Where?
I added the second line parallel to FFA line. [all times ~]
That part of the descent is FFA. 0.6s - 12.4 to 13s
This line is obviously not a good linear fit to the velocity curve in that onterval. Any conclusions you wish to draw from that line are thus bonkers.
In the velocity graph, as you posted it, v is 4.9 ft/s at 12.6 seconds, and 25.6 ft/s at 13.1 s.
So over an interval of 0.5 seconds (+/- 0.01 s, from pixel resoltion of the as-is graph) I get a delta-v of 20.6 ft/s (+/- 0.4 ft/s).
That's an AVERAGE acceleration of 41.2 ft/s
2 (considering margin of error of measuring pixels: anywhere between and 39.6 and 42.9 ft/s
2). Standard gravity is 32.174 ft/s
2.
Can you explain that? What did I do wrong when I computes the average over a significant period?
(Gauging the curve, it slopes steeper than your black lines throughought most of that interval: At beginning for at least 0.1 s, at the end for at lest 0.1 s, and from 12.83 to 12.94 s again for slightly more than 0.1 s. Only at just before 13 s, there is a short period with less than g)
There is 1.8s of FFA between the two vertical lines - 13.1 to 14.9
Could be interpreted as 1.75s
Yep, and this jives wonderfully with what femr2 said:
"I'd be okay with... ~1.75s of ~FFA, of which >~0.5s is over-g ... for the NW corner. "
A total of 2.5s with a moment of >g that I would attribute to a slight movement of the camera, several miles away.
What can be asserted without evidence can be dismissed without evidence.
Where is your evidence that this camera movement happened AND was not already accounted for by femr2's method? Remember: He DID account for camera movement!