• | Start Relative Surface When a Surface or Pelagic layer is chosen, this setting controls the depth at the upper boundary of the layer relative to the surface depth.
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• | Start Relative Bottom When a Bottom layer is chosen, this setting controls the depth at the upper boundary of the layer relative to the bottom.
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• | Range This parameter controls the vertical depth range for the layer. Positive values are always downwards. A start range relative to bottom of for example -10 m means 10 m above the bottom.
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• | Surface The range settings for the layer are referenced to the surface. The layer is downwards limited by the detected bottom depth if this value is shallower than the specified lower range limit
for the layer. "Pings" without a bottom detection are ignored in the calculations.
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• | Pelagic The range settings for the layer are referenced to the surface. The layer is not downwards limited by the detected bottom depth.
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• | Bottom The range settings for the layer are referenced to the bottom. The layer is downwards limited by the detected bottom depth.
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• | Targets Integration This value can be used to get an idea of how much of the biomass has been detected as single targets, compared with the normal
integration (sA). Check this box to calculate integration values based on single target detections.
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• | Bottom Margin When you set up the ME70 to measure and calculate echoes from the water column, the bottom echo must be avoided. The strength of this echo will greatly influence the other acoustic measurements. Use the Bottom Margin option to define a vertical depth segment above the detected bottom echo. The data in this segment will not be included in the calculations.
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• | Sv Threshold The Sv Threshold option is a filter. It will remove the weakest echoes from the calculations the ME70 do.
Example
If you are bothered by plankton while investigating other species with higher target strength, use the Sv Threshold option to remove the plankton echoes.
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