About cells

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 0.4 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:

Cells must be defined on an echogram before Analysis by Cells or Analysis by Regions by Cells can be exported.
The grid is set up and applied to the echogram on the Grid page of the Variable Properties dialog box.
Press CTRL + L to view the layer and interval numbering on the echogram.

About cells

See also