This dialog box allows you to add or remove Background Terrains (see Background Terrains in Terrain Help for more information). It is accessed from the View - Active Window (Plan) Options in Terrain or View - Plan Option in Location or View - Active Window (Profile) Options in Terrain. In Survey, it is accessed from View - Options.
Pressing this key will activate the standard Windows File Open Dialog, allowing you to select a background Terrain file.
Will remove the currently selected background Terrain.
Pressing this key will activate the Background Display Properties Dialog which allows you to control the display of backgrounds in either the Plan or Profile windows.
The selected background file will be displayed in Plan or Profile if this check box is checked.
The display order of the backgrounds is controlled by the sequence of the Terrains in the list box. The Shift Up and Shift Down buttons move a file up or down in the list.