Abstract: A display method and apparatus in which a two-dimensional display constituting a perspective view of a three-dimensional surface consists of an array of discrete points appearing to model the surface. An aircraft pilot is provided with a display of ground terrain ahead of his aircraft using stored data representing the terrain.

Abstract: A method and apparatus for using stored data to produce a representation of a surface from the perspective of a platform moving across the surface (e.g. of ground terrain from an aircraft overflying the terrain) wherein the representation comprises a perspective view of an array of elements modelling the surface and the orientation of the array with respect to the surface changes with the direction of movement of the platform across the surface so as to keep the array aligned with the direction of platform movement and so avoid confusing changes in the display with changes in platform movement direction.