deletions | additions       diff --git a/Methodology Video Data.tex b/Methodology Video Data.tex  index c106c78..279fdab 100644  --- a/Methodology Video Data.tex  +++ b/Methodology Video Data.tex 
...
\subsubsection{Derived Data: Velocity & Acceleration}  Velocity and acceleration measures are derived through differentiation  from positionover time  and velocity over timemeasures  respectively. These are 2-dimensional  vectors with a magnitude (speed) (speed and acceleration)  and a heading. The heading of the velocity vector is typically used to determine the orientation of the vehicle. However, derivative measures are more sensitive to tracking error from pixel precision. As such, these measures require smoothing, over five to ten frames. Instantaneous measures, particularly acceleration spikes, are therefor more difficult to detect reliably.