Multichannel False Color Echograms as a Biological Interpretative Tool
Image processing systems permit display of multichannel acoustic backscatter echograms as false color imagery. This technique for rapid visual assessment is illustated with 51 and 200 kHz acoustic data from Emerald Basin located in the central Scotian Shelf. Direct multilevel net sampling shows that strong 200 kHz scattering layers below 100 m depth are compatible with “Rayleigh” scattering from copepods. Layers in the upper 60 m scattering with nearly equal strengths at 51 kHz and 200 kHz are ascribed to comparatively large fish scattering in the “geometric” regime.
KeywordsFalse Color Target Strength Fluid Sphere Noise Cancellation Copepod Density
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