You can add your own entries to the database, provided the names of the entries do not duplicate existing names. User-defined entries can be deleted, but original entries cannot.
To add an item:
1. Select the icon for the category of data that you want to add. For example, to add an ellipsoid, click the Ellipsoids icon.
2. Right-click anywhere in the ellipsoids listing, and select New from the pop-up menu.
A New entry is added to the list.
3. Click on the new entry and type the name for your entry, over-writing “New”.
In order for your new entry to be saved to the database, it must have values defined for the properties. If you do not define the properties, the new item will be removed from the list when the editor is closed.
4. Type appropriate information in the properties fields in the list on the right.
5. Click OK to save your changes to the database and close the dialog box.
Deleting entries
While the original items in the Vertical Reference System database are read-only, any user-created entries can be deleted.
To delete a user-defined entry:
1. Select the entry.
2. Right-click in the pane and select “Delete” from the pop-up menu.
3. Click OK in the dialog box to confirm the deletion.