Parallel Optical Processing to Convert Elevation Data to Slope Maps. Phase 1. Theoretical Analysis.
Research note Jul 72-Oct 74,
ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA
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Given a photographic transparency with an amplitude transmittance function, tx sub o, y sub o, that is equivalent to a functional representation of elevation information, h x sub o,y sub o, for a particular geographic area, the slope information can be rapidly displayed using a coherent optical system and a one-dimensional differentiating filter. Implementation of this technique could provide an electro-optical system for the high speed conversion of elevation data to a slope map. It is concluded that slope map displays can be obtained from elevation function transparencies, though negative and positive slopes of the same magnitude are displayed identically. This is not expected to affect the utility of the output.
- Cartography and Aerial Photography