The base class of all Terrain Overlay and Globe Image Overlay objects.
  CentralBody | Gets the Central Body that the Globe Overlay is displayed on. It will return null if the Globe Overlay hasn't been added to a Central Body. | 
  DisplayCondition | Gets or sets the Display Condition that controls whether or not the Globe Overlay is displayed. | 
  Extent | Gets the Cartographic Extent that represents the area covered by the Globe Overlay. The array elements are arranged in the order west longitude, south latitude, east longitude, north latitude. | 
  IsValid | Gets whether or not the overlay is valid. It can be invalid because of a missing file, corrupt file, unlicensed file, or a file on the incorrect Central Body. | 
  Role | Gets the Globe Overlay Role of the Globe Overlay. | 
  UriAsString | Gets the absolute URI specifying the location of the Globe Overlay. | 





