Advanced Sampling Technologies Research Group
Fisheries Acoustics Award Winning1 Visualizations
Acoustical data are usually displayed as two-dimensional 'echograms' - vertical dimension through the water column, and time or distance along the horizontal axis. These echograms are used for viewing and evaluating the data. We have developed three-dimensional visualizations of multi-frequency acoustic data to view the data in geographical space from small to large spatial scales (3D Echograms). Acoustic data are commonly used to provide relative indices of species-specific abundance and biomass. In order to scale the relative indices to absolute estimates, we must incorporate a measure of the echo amplitude from an individual fish (3D Modeling). Fish are complicated acoustic scatterers by nature of their complex anatomy and behavior. We have developed three-dimensional visualizations of the fish body and swimbladder from x-ray and Computerized Tomography (CT) images (3D Computerized Tomography). These images are used in theoretical models to improve prediction of acoustic scattering over a wide range of frequencies and fish orientations. These visualizations include three-dimensional movies of acoustic survey data, internal anatomy of selected fish species, and predicted acoustical backscatter. Unless otherwise noted, all visualizations were coded completely in IDL (Interactive Data Language) by David F. Chevrier with the constant support of Dr. J. Michael Jech.
In order to view the large files (.avi), you will need to use Windows Media Player, Real Player, or any other media player that has an MPEG-4 codec. The small files (.wmv) will only run using Windows Media Player. (Note: the smaller files are of significantly lesser quality than the larger ones.) While it should work on older editions, it is recommended that you use the latest version (9.0) of Media Player. It is a free download available at the Microsoft software download site (http://www.microsoft.com/downloads/).
1 - FARG took home the “Best Visualization in Research” award at the NOAATech 2004 conference.