Beam Select
This operator selects the data for a specified beam from a multibeam input operand. Pings will not be included if the specified beam is horizontal or the tilt angle of the ping is different to that of the first ping in the input operand.
The Beam Select provides an overview of ping multibeam data for a specified beam. For H-mode data, the number of pings output by the operator can be significantly reduced when the tilt angle changes. An alternative technique that accommodates a directional overview is to use a Beam Subset operator, followed by a Maximum Intensity operator.
You select the beam on the Beam Select page of the Variable Properties dialog box.
Echoview accepts a single operand of the following data types as input:
- Multibeam angular position
- Multibeam boolean
- Multibeam color
- Multibeam magnitude
- Multibeam phase
- Multibeam Sv
- Multibeam TS
- Multibeam unspecified dB
Notes:
- Depth is calculated in a different way in this echogram.
- This operator takes calibration settings from the formed beams operand or beam 0. In the case where beam calibration differs from beam 0, this operator may output unintended results.
- See Beam selection for more information.
- Increment beam keyboard shortcut.
Settings
The Beam Select Variable Properties dialog box pages include (common) Variable Properties pages and these operator pages:
Operands page
Beam Select page
|
Setting |
Description |
|
Beam number |
Enter a beam number from 0 to 127 for *.bmf data files, or from 0 to 79 for *.raw data files. The selected beam will be used to create the variable which can then be displayed as a two-dimensional echogram. |