Line Bitmap

This operator is used to create a bitmap based on two specified lines. It marks as false any data point with a depth above the start line or below the stop line. There is an option to invert the output so that false data points become true and vice versa.

See also: The Effect of No data samples on the Wideband Frequency Response graph page.

Echoview accepts a single operand of the following data types as input:

Angular position
Boolean
Color
Complex angular position
Complex power dB
Complex Sv
Complex TS
Linear
Power dB
Pulse compressed complex angular position
Pulse compressed complex power dB
Pulse compressed complex Sv
Pulse compressed complex TS
Sv
TS
Unspecified dB

Settings

The Line Bitmap Variable Properties dialog box pages include (common) Variable Properties pages and these operator pages:

Operands page

Line Bitmap page

Settings	Description
Start line	Specify the two lines to use to create the bitmap. Data points located above the start line or below the stop line are assigned a value of 'false'. Note: The start line must be located at a depth that is above depth of the stop line or all data will be marked as 'false'.
Stop line
Invert output	Select this option to invert the output, i.e. mark 'false' data points as 'true' and vice versa.