Fish Track Analysis Results dialog box

The Fish Track Analysis Results dialog box displays the results of analyzing a single fish track region.

To display the Analyze Fish Track Region dialog box:

Select a fish track region on a single target echogram.
On the Shortcut (right-click) menu, click Analyze Fish Track.

The following information and settings are available:

Analysis variable	Description
General
No. of single targets	The number of targets in the analyzed track.
Mean TS	The mean in the linear domain of the TS values of the targets in the track.
Mean range	The average range over all targets in the track in meters. See About beam geometry for more details on range in Echoview.
Mean target length	The average target length of all targets in the track. See About target length mean. Note: Only variables that include target length estimations will display a result. See About target properties.
Speed
Mean 2D speed (unsmoothed)	The accumulated distance between targets in the track over the time.
Maximum 2D speed (unsmoothed)	The maximum change in range over time between two targets is the track.
Mean 4D speed (unsmoothed)	The mean 4D swim speed is the accumulated distance between targets in the track (plotted in 3D space) over the time.
Maximum 4D speed (unsmoothed)	The 4D Max swim speed is the maximum of all the speeds calculated for a track.
3D Tortuosity	The sum of the distances between adjacent targets in a track (that is, the total distance traveled) divided by the straight line distance between the first and last targets in a track (Johnson & Moursund, 2000).
Direction
Change in range	The range of the first target minus the range of the last target in a track.
Horizontal direction	The horizontal direction is calculated from a line drawn from the first to the last target in a track. See About beam geometry for more details.
Vertical direction	The vertical direction is calculated from a line drawn from the first to the last target in a track. See About beam geometry for more details.

Notes:

2D calculations infer that the data are from a single beam transducer. That is, angle data for split or dual beam transducers will be ignored for 2D calculations. All targets are treated as if they are at the center of the beam. For fixed transducers or transducer data with no GPS positions, a 2D speed is the change in range between adjacent targets in a track over time.
Given adjacent targets in a track, a 4D speed is the distance in meters between targets (plotted in 3D space) divided by the number of seconds between the targets' ping times.
These and other fish track analysis variables can also be exported to a single .csv file for all fish track regions in an echogram. See Exporting fish track analyses for details.

Linked

Select Linked to link the displayed results to the currently activated fish track region. The displayed results will update as you select subsequent fish track regions on the echogram.

Notes: With Linked selected, the dialog box will respond to the activated fish track region on the Region browser and the Regions window.

Fish Track Analysis Results dialog box

Linked

See also