Cells are defined by a grid on an echogram. Each cell defines a set of sample values on an echogram, from which analysis variables can be exported or displayed on-screen.
An echogram is divided into cells according to the time/distance and horizontal grids. Cells are only created if both time/distance and horizontal grids are applied. Cells (identified by layer and interval numbers) are referenced relative to a line in the EV file or the line for zero depth or line for zero range.
The vertical grid has time/distance units that are specified with a selection from the Time/distance grid list. A selection of units are available, and allows flexibility in choosing the echo integration interval (sometimes referred to as "reset distance").
The horizontal grid has Depth/range/Line-referenced units that are specified with a selection from the Depth/range/Line-referenced list. The grid units are referenced to a selected line.
The figure below shows a grid that has been defined in 0.5 nautical mile intervals and 20 meter depth layers. The red analysis-hatching indicates that an on-screen integration or on-screen analysis has recently been completed for the cell.
Notes:
Integrating cells
Exporting cell analyses
About analysis variables
About interval and layer numbers that identify cellls