Bottom_max_Sv

Bottom_max_Sv (dB re 1m2/m3) is a bottom feature that may be extracted during bottom classification. A Bottom_max_Sv analysis variable can be selected under Bottom on the Export page of the EV File Properties dialog box. It can be included with onscreen analyses and exported.

Bottom_max_Sv represents the mean maximum Sv (dB) of the first bottom echo in the Feature extraction interval for a bottom classification.

Bottom max Sv

Where:

j
=

Bottom point in a bottom points variable.

Bottom point number j is assigned sequentially in time. Each bottom point is associated with a set of pings defined by the value for the Feature extraction interval.

i
=

Ping i in the Feature extraction interval for bottom point j.

maximum Sv i
=

Maximum Sv (dB) of the first bottom echo in ping i in the Feature extraction interval for bottom point j.

n
=

The number of pings as specified by the Feature extraction interval for bottom point j.

See also

About bottom classification
Bottom classification algorithms
EV File Properties dialog box