Maximum pitch and roll

The minimum depth is important for several reason. Vertical profilers need about one body length to accelerate to about 80% of their asymptotic speed. Thus, a minimum depth of about two body lengths. The hull of the ship used to deploy a vertical profiler may reach several meters and data from less than hull depth should be excluded. While a glider is at the surface, shear-probe data has no value. A minimum depth of 1 to 2 m should be applied to gliders (in dives) to exclude data that are not useful for dissipation rate estimation.

When vertical profilers and gliders start their profile, there may be considerable pitching and rolling of the vehicle before it settles into a more consistent flight. Thus, these parameters can also be used to exclude regions that produce poor data.