Grid page

The Grid page of the Variable Properties dialog box is used to enter settings for the display, integration and export of cells grid.  The same grid is used for display on the echogram, along-track display and for analyses over cells.

The Grid page may also be displayed for selected multiple variables (on the Dataflow window).

Settings

Description

Show time/distance grid

Choose the type of time/distance grid you want to use from the list, then specify the separation between grid lines. The minimum value for entry is 0.01.

These settings define the intervals reported in the analysis export and displayed on the screen.

Start interval numbers at the start of the echogram

Select this setting to enable relative interval numbering. The horizontal grid and interval numbers begin from the start of the variable.

Clear this setting to enable absolute interval numbering. The horizontal grid interval numbers begin from the first GPS fix (cruise track) or vessel log.

Note: The distance value for the start of the variable can be different to the distance value for the first GPS fix. This setting may affect Dist_S, Dist_M and Dist_E calculations. See also About interval and layer numbers.

Show depth/range/Line-referenced grid

Choose grid type from the list to apply a depth/range grid to the echogram, then specify the Separation (m) between the grid lines.

The grid separation depends on the Echogram mode. It is applied as a depth separation when the echogram is in depth mode and is applied as a range separation when the echogram is in range mode. See About depth, range and altitude.

These settings define the layers reported in the analysis export.

Notes:

  • Layers are numbered relative to the Depth/range/Line-referenced setting. The name of line can be exported as the analysis variable Grid_reference_line. This and related analysis variables can be specified under the Analysis Domain group on the Export page of the EV File Properties dialog box.
  • A hidden line becomes visible when it is selected as a grid reference-line.

Depth/range/Line-referenced grid list

Description

Transducer face (range of zero)

Available when the Echogram mode is set to Range.

Range (m) is measured from the line Transducer face (range of zero).

Transducer face (range of zero) is equivalent to the Range Grid option available in versions prior to Echoview 5.

Water surface (depth of zero)

Available when the Echogram mode is set to Depth.

Depth (m) is measured from the surface specified by the Z coordinate of the water level on the Position page of the Platform Properties dialog box..

Water surface (depth of zero) is equivalent to the Depth Grid option available in versions prior to Echoview 5.

Line-reference

Names of available lines in the EV file.

 

 

Note: A grid is currently not supported for multibeam echograms with a 360 degree sector angle.

See also

About exporting analyses
About on screen analyses
About integration
Variable Properties dialog box
About layer and interval numbering for cells