Fisheries and Habitat Mapping

Fisheries

This animation shows a gillnet and schools of fish colourized by both intensity and depth. The net has an opening near the centre, and the anchor line at the near end and along the bottom of the net is also evident in the backscatter intensity. The schools of fish are weak water-column targets that do not cast shadows and are therefore not easily visible with 2D Side Scan, but are immediately apparent in 3D Side Scan.

Habitat Mapping

The animation to the right shows an Eel Grass bed colourized by depth (blue is deeper) and by acoustic reflectivity (yellow is stronger reflectivity). The Eel Grass may be recognized by its irregular bathymetry and its reflectivity fluctuations. Depth callouts on both displays show the height of the Eel Grass relative to the seafloor depth as well as the difference in depth variability for both the Eel Grass measurements and the sandy seafloor. A large rock is also labeled with its minimum depth.

The animation below shows a section of the Molasses Reef near Key Largo, Fla. The data is displayed as collected in real time and is shown colourized by both backscatter amplitude and by depth (bathymetry). The backscatter amplitude display is a geometrically correct 3D view and indicates fine structure. The high resolution bathymetry display clearly delineates the reef. Both images cover a swath width of approximately 15 times the sonar altitude.