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|Title:||Parallel optical processing to convert elevation data to slope maps. Phase I, Theoretical analysis|
|Authors:||Geographic Sciences Laboratory.|
Brooke, Robert K.
|Keywords:||Coherent optical processing|
Optical data processing
|Publisher:||U.S. Army Engineer Topographic Laboratories.|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Research note (U.S. Army Engineer Topographic Laboratories) ; ETL-RN-74-9.|
Abstract: Given a photographic transparency with an amplitude transmittance function, that is equivalent to a functional representation of elevation information, 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.
|Appears in Collections:||Documents|