The Output empty cells option on the Export page of the EV File Properties dialog box is used to select whether data from empty cells should be included in the following exports:
If you select this option data that describes the cell (e.g. cell layer number and interval number, minimum and maximum layer depth, number of the first and last ping in the cell) will be exported. Data that describes the contents of the cell will be exported as zero or a special export value.
The definition of an empty cells differs by export type.
Empty cells are:
cells entirely below an exclude below line
cells entirely above an exclude above line
cells entirely within a bad data region
cells that do not contain any analysis regions (Integration by regions by cells exports only)
Notes:
Empty cells that are excluded by lines or bad data regions will not be analyzed.
Empty cells that have not been excluded by lines or bad data regions will be analyzed.
Empty cells appear at the bottom of export file after the output for all non-empty cells.
Empty cells are:
cells entirely below an exclude below line
cells entirely above an exclude above line
cells entirely within a bad data region
cells that do not contain any targets
cells that do not contain any analysis regions (Single target analysis by regions by cells exports only)
Notes:
This is only applicable to the following selections, Echogram menu: Export > Analysis by XXX > Single Targets. Users who use frequency distribution graph analysis are advised to read information about Frequency distribution graphs and Exporting single target frequency distributions.
If you are exporting using the database format, the empty cell information will be added to the cells file but will not be added to the targets file.
Empty cells are:
cells entirely below an exclude below line
cells entirely above an exclude above line
cells entirely within a bad data region
cells that do not contain any fish track end points
Notes:
Empty cells appear at the bottom of export file after the output for all non-empty cells
If you are exporting using the database format, the empty cell information will be added to the cells file but will not be added to the targets file
The Num_targets analysis variable displays different data for empty cells and non-empty cells:
For non-empty cells it displays the number of single targets in the fish track region. See also About fish track regions - Inclusion in cells
For empty cells it displays the number of single targets in the empty cell