About Speed_4D_max_unsmoothed

Speed_4D_max_unsmoothed is an analysis export variable available in exported fish track analyses.

It reports the maximum speed (distance over time) between adjacent targets in a fish track region measured in 3 dimensional space, using angle data (m/s).

This variable is exported only if it is selected on the Export page of the EV File Properties dialog box.

Notes:

The _2D_ fish track analysis variables use only time and range information (ignoring angle data if present). All targets are treated as if they lie at the center of the acoustic beam. The _3D_ and _4D_ fish track analysis variables use, time, range, and minor and major axis angular position information.
Under a fixed platform, consider using Heading source: Fixed heading (north) for a more appropriate reference for fish track distance and speed calculations. For more information refer to About fish tracks: Notes.

About Speed_4D_max_unsmoothed

See also