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Frequency distribution graphs of single beam Sv, TS, unspecified dB, boolean, linear, single target and target length data are displayed as bar charts that show the percentage of samples within a selection or region that fall within defined sample range bins. The sample range bins are specified in the units relevant to the echogram variable; for example, dB re m-1 for an Sv variable. The minimum and maximum range values and the number of bins that are displayed are set on the Analysis page of the Variable Properties dialog box.
Frequency distribution graphs of angular position data are displayed as a 3D bar chart showing the percentage of each combination of minor-axis, major-axis angle in the selection or region. The minimum and maximum values are the same as the angle ranges set on the Display page of the Variable Properties dialog box.
Frequency distribution graphs of multibeam magnitude, Sv, TS, unspecified dB, boolean, and phase data are displayed as bar charts that show the percentage of samples within a selection that fall within defined sample range bins. The sample range bins are specified in the units relevant to the echogram variable; for example, radians for a phase variable. The minimum and maximum range values and the number of bins that are displayed are set on the Analysis page of the Variable Properties dialog box.
To display a frequency distribution graph of a selection:
Make a selection.
On the Shortcut (right-click) menu, point to Graph Selection, and then click Frequency Distribution.
To display a frequency distribution graph of a region:
Select an existing region or define a new region.
Note: If you wish to graph a bad data region, you must clear the Exclude bad regions option on the Analysis page of the Variable Properties dialog box.
On the Shortcut (right-click) menu, point to Graph Region, and then click Frequency Distribution.
Note: Frequency distribution graphs updated automatically when properties of the data within the region change (except where the boundaries of a region are changed after creating a graph).
About Linking Graphs
Frequency distribution graph keyboard shortcuts