Calibration settings for WASSP 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 WASSP data files.

We recommend you assess the suitability of the settings available on the Calibration pages for each acoustic variable. Some settings will be 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 and which are used for other calculations. The table also details the values used to calculate ranges that Echoview reads straight from the data file.

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

Variables from WASSP *.nwsf data files

Setting

Data point values

 Range

Unspecified dB frames

All acoustic variables

Calibration page of Variable Properties dialog box

AbsorptionCoefficient

 

 

Frequency

 

 

SamplingFrequency

 

Y

Soundspeed

 

Y

TransmittedPulseLength

 

 

Notes:

See also

WASSP data files
Raw variables derived from WASSP data files
About calibration settings
Entering calibration settings