ACOUSTICS UNPACKED

A General Guide for Deriving Abundance Estimates from Hydroacoustic Data

 
 

 

 

Correction of incorrect settings

It is important to remember which system and data collection settings may be changed in post-processing.  Table 6 is a summary of system settings and collection settings and whether they can be modified in post-processing.

 

Table 6.  Modification status for system and collection settings.

Setting

Modifiable

Not modifiable

Simrad and Biosonics

 

 

Transducer gain

■

 

Pulse duration

 

■

Ping rate

 

■

Raw data depth/range

 

■

File size

 

■

Transducer depth

■

 

Collection thresholds1

 

■

Sound speed

■

 

Absorption

■

 

 

 

 

Simrad only

 

 

Sa correction

■

 

Power setting

 

■

Equivalent beam angle

■

 

3 dB angle

■

 

Bottom backstep

■

 

 

 

 

Biosonics only

 

 

Threshold model

 

■

1 does not apply to Simrad raw data