Scanner sweep

Scanner sweep is an ability manifested by a terran structure. It can reveal an area within the fog of war and detect cloaked or burrowed units with the ara.

StarCraft

 * Scanner Sweep
 * Starting and sole ability
 * Energy Cost: 50
 * The Scanner Sweep uses highly concentrated scanners to reveal an area, including cloaked or burrowed units. This can be executed anywhere on the map at any time. The circular view shown lasts for about 10 seconds before changing to the fog of war static view. A scanner sweep is indicated to all players (including the one doing it) by a series of blue 4-pointed sparkles moving in a circle.

StarCraft II
The surveillance station has the ability to clear the fog of war from a small area temporarily, analogous to the ComSat station in StarCraft I. Once upgraded, it can no longer lift off, nor can it be downgraded back to a command center or upgraded into a planetary fortress, but it continues to produce SCVs normally.