The objective of this study was to determine the feasibility of measuring terrain from aerial stereo-photos displayed in the form of holographic stereograms. Holographic stereograms are attractive for this application because they have the potential of providing a simple but vivid display with rapid access. An optical analog device was used as the basis for measurement. By using a set of Balplex (Ref. 1) plotting instruments in turn as projectors and cameras, we obtained projections of the optical terrain model and of a fabricated grid model, onto a datumplane. The left and right projections were recorded photographically and holographically, and were interpreted for measurement by an exact algorithm which is most conveniently implemented by computer.