Aerial shots are usually done with a crane or with a camera attached to a special helicopter to view large landscapes. This sort of shot would be restricted to exterior locations. A good area to do this shot would be a scene that takes place on a building. If the aerial shot is of a character it can make them seem insignificant or vulnerable.
In film, a Bird's eye shot refers to a shot looking directly down on the subject. The perspective is very foreshortened, making the subject appear short and squat. This shot can be used to give an overall establishing shot of a scene, or to emphasise the smallness or insignificance of the subjects. These shots are normally used for battle scenes or establishing where the character is. It is shot by lifting the camera up by hands or by hanging it off something strong enough to support it. For a scene that needs a large area shot, then it will most often likely to be lifted up by a crane or some other sort of machine.