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.

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.

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.

Bottom_max_Sv

See also