Calibration settings for BioSonics data
This page describes the settings, necessary to an Echoview calculation, on the Calibration page of the Variable Properties dialog box for acoustic variables derived from Biosonics data files.
We recommend you assess the suitability of the settings available on the Calibration pages for each acoustic variable. Some settings are used to calculate data point values or ranges, others may be used during analysis or display of the data. The table below shows which settings are used for calculating data point values and ranges, which are used for other calculations and which settings may not be used by the variable.
Quantitative calculation/analysis requires calibrated data which is achieved using correct calibration setting values (rather than default values). An ECS file enables you to modify calibration settings for variables in a fileset.
Changes in calibration settings used for range calculations may shift ping data in the depth dimension but will not automatically adjust the position of regions and lines. You should review any existing regions and lines to ensure they are still valid. For more information refer to Range calculation effects on regions and lines.
Note: Data file values that have been used since the data was loaded or the ECS file was added, saved or removed are displayed in black text. Default values that have been used are displayed in orange text. Data file or ECS values that have been read but not used are displayed in grey text. Read About calibration settings for further information.
Table legend:
|
Y |
Setting is used in calculating data point values or ranges as indicated by the column heading. |
|
|
Setting is not used in calculating data point values (when green background) or ranges (when blue background) but may be used for other purposes, see Additional uses of Calibration settings |
|
|
Setting is not available for this variable |
|---|
|
Setting |
Data point values |
Data point range |
||
|---|---|---|---|---|
|
Sv |
TS |
Angular positions |
All acoustic variables |
|
|
Y |
Y |
|
|
|
|
Y |
|
|
||
|
|
Y |
|
|
|
|
Y |
Y |
|||
|
|
|
|
|
|
|
Y |
||||
|
|
Y |
|||
|
Y |
||||
|
|
|
Y |
||
|
Y |
Y |
|
|
|
|
Y |
|
Y |
Y |
|
|
Y |
Y |
|
|
|
| Y |
|
|
|
|
|
Y |
Not used for the TS variable. |
|||
|
Y |
|
|
|
|
|
|
||||
|
From data file |
||||
|
InitialBanking |
Y |
Y |
Y |
|
|
SamplePeriod |
Y |
Y |
|
Y |
|
SamplesPerPing |
Y |
Y |
|
Y |
Notes:
- If you know the frequency, temperature and salinity, you can calculate the absorption coefficient calibration settings using the Sonar Calculator. The sound speed and absorption coefficients are calculated using standard formulae. Echoview does not calculate these automatically from the settings in a data file. Choose Show information from the shortcut menu (right-click) to determine the settings that are recorded in a BioSonics data file.
- Some BioSonics echosounders are equipped with an option to operate at a reduced power level. Echoview reads the reduced power level from the data file and calculates Sv and TS taking into account the reduced power level.
- + The MajorAxisAngleOffset and MinorAxisAngleOffset are read from the data file but can be overridden with values obtained during the calibration of an echosounder with a calibration sphere. See also BioSonics data files: Calculation of angles for split beam transducers.
- 1 TwoWayBeamAngle is calculated using the 3 dB beam angles. Alternatively, a value can be specified using an ECS file which is added to the fileset.
Other required calibration settings are read from the BioSonics data file (EEPROM structure).
See also
About calibration settings
Entering calibration settings
BioSonics files
Raw variables derived from Biosonics data