Sometimes referred to as Double Exposure. Two images can be seen at the same time on the screen as they transition from one sequence of actions to another. This occurs when the editor uses a special effect generator or motion projector to simulate the passage of time and space. The method requires a successive number of dissolves to transpose the images at variable lengths of speed.
A software/hardware unit which interjects the generated digital map data into the optical path of the stereoplotter and reproduces it directly on top of the spatial photo image. Superimposition allows simultaneous viewing of the photographic image and mapping data being compiled.
Superimposition is a graphics term meaning the placement of an or video on top of an already-existing image or video, usually to add to the overall image effect, but also sometimes to conceal something (such as when a different face is superimposed over the original face in a photograph).