[photogrammetry]
A technically complex way to display the terrain stereoscopically using a special computer monitor that alternates two maps at least 30 times a second. The first map is displayed with horizontally polarized light, the second with vertically polarized light. Map viewers wear special goggles with polarizing filters that allow the right eye to see only the horizontally polarized map and the left eye the vertically polarized map, so that the terrain is seen stereoscopically in the mind. Also called stereoscopic projection.