Surface Layers
Manage the order and visibility of surface and sub-surface layer data such as ground imagery, as well as the model terrain You can also create new surface or sub-surface layers.
Click Manage 
Display 
(Surface Layers) to open Surface Layers. You can use this tool to add or modify surface layers.
Note: You can also toggle the display of surface layers on or off in the cross section view tab of the Profile View.
Hide/Show Layer
Hide or show surface layers in the model. When the light bulb image is yellow, the surface layer is displayed; when it is white, the surface layer is hidden.
Features that conform directly to the terrain (terrain, coverage, water, railways, and roads) are considered "surface layers." The Hide/Show control for those features controls their display as a group.
Surface Layer Settings
Indicates that a surface layer has settings that can be modified in the stack.