Fish track detection can be carried out on a selection or on the entire single target echogram. The single target echogram can either be a raw variable or a virtual echogram. See About single target detection for more information.
Echoview offers the choice of two fish track detection algorithms:
The 2D algorithm uses the range and time information of the single targets
The 4D algorithm is intended for use with split beam data and uses the angular position information of the targets in the beam in addition to the range and time
The display thickness of single targets will affect fish track detections. Fish track regions will be drawn around entire single target display thickness. See Configuring single target display thickness for information about changing the display thickness of single target detections.
Note: The single target variable needs to have at least two pings for a fish track detection.
To detect fish tracks in a selection of an echogram:
Bring the single target echogram into focus
Make a selection using one of the selection tools
On the Shortcut menu (right-click), click Detect Fish Tracks
In the Assign class list, select a region class to assign to the detected fish tracks (click Edit to create a region class if required)
If you want to delete fish tracks of the chosen class from the selection prior to detecting fish tracks, select the Delete existing regions with this class first option
Click Properties to open the Track Detection Properties dialog box
Click the Algorithm tab
Choose a detection algorithm and enter other detection settings as required, see Algorithm page for more information
Click the Weights tab
Enter required weight settings, see Weights page for more information
Click the Track Acceptance tab
Enter required track acceptance settings, see Track Acceptance page for more information
Click OK to close the Track Detection Properties dialog box
Click Detect
To detect fish tracks in the entire echogram:
Bring the single target echogram into focus
On the Echogram menu, click Detect Fish Tracks
Complete steps 4 to 14 above
Once fish track regions have been drawn, it is possible to graph fish tracks, analyze single fish tracks, export fish track analyses, edit fish tracks and create 3D fish tracks.
About fish track detection
About fish track regions
Fish tracking algorithms
About beam geometry
Exporting fish track analyses
Fish Track Analysis dialog box
Detect Fish Tracks dialog box
Fish track editing
Configuring single target display thickness