Analysis page

Settings

Description

Exclude above line

Select a line above which the sample data is excluded from analysis.

Exclude below line

Select a line below which the sample data is excluded from analysis.

Exclude pings with bad line status on the exclude below line

If selected, this option will exclude from analyses those samples in pings where the line status of the exclude-below line is bad.

Exclude bad data regions

If selected, this option excludes samples within bad data regions from analyses. This setting is selected by default.

Whole excluded or no-data pings do not reduce the Thickness mean

If selected, this option identifies whole pings that consist entirely of excluded samples and/or no-data samples and directs Echoview to use analysis calculations that do not reduce the Thickness mean.

Generally this setting helps you to you to set up the conditions where NASC can be represent the water volume you intended. However, there is one case where this settings' behaviour may not be desirable.

Refer to About samples and echo integration for more information.

Setting

Description

Background noise Sv at 1m

Specify the background noise level that will be used in calculating background noise in an analysis domain.

Note: You can use the Ping graph Constant-Power Curve to visually estimate this value for an Sv echogram.

Settings

Description

Minimum value

These settings apply to the display of frequency distribution graphs for the selected variable.

When a single target variable is selected, these settings will also affect the output when exporting frequency distributions.

Maximum value

Number of bins