Group Areas

The Group Areas command is used to manually group shoal areas.

Using this command, you select shoal areas that you wish to have in a group. Any existing groups containing the selected shoal areas will be removed. If there are other shoal areas that were not selected, but that were part of the original, affected shoal group(s), then the following will be created:

• one group containing the selected area(s), and

• one or more groups containing the remaining area(s) from the original groups.

After regrouping, the shoal boxes for all of the affected shoal groups are automatically recreated to reflect the changes.

To group shoal areas:

1. Select the Shoal Areas layer in the Layers window.

2. Select the shoal areas in the Display window that you want to group.

3. Select the Group Areas command.

The Group Areas dialog box is displayed.

When the shoals were detected, a specific reference model was used to determine reference depth and orientation. The same station catalogue must be used when working with the shoals. By default, the last selected station catalogue will be selected in the dialog box.

4. Ensure that the correct Station catalogue is selected from the drop‑down list.

The Minimum depth precision field allows you to define the number of decimal places to include in the Minimum depth value of shoal boxes. The default value is 2.

5. [Optional] Change the Minimum depth precision value.

6. Click OK.

The selected shoal areas are grouped and re-boxed. You can verify that the shoals have been grouped by re-selecting the shoal areas and viewing the Collection Feature ID value for each shoal in the Selection window. All shoal areas in a group will have the same value for this attribute.