Knowledge Core Collection:
https://hdl.handle.net/11681/46575
2024-03-28T08:17:14ZAnalysis, storage and retrieval of elevation data with applications to improve penetration
https://hdl.handle.net/11681/5081
Title: Analysis, storage and retrieval of elevation data with applications to improve penetration
Authors: Klinger, A. (Allen), 1937-
Description: Research note; Abstract: A method to use terrain elevation data for guidance is presented. Tree structure representation of contour trend data over regions is the basis of the method. Regions of different sizes obtained by quartering given elevation matrices are used; region size corresponds to tree position. Two computer functions are discussed: analysis methods to use tree-structured contour-trend information, suitable for onboard inflight computations; and storage reduction methods to present elevation data as a new digital mapping product (tree-structured contour-trend data), computable off-line on the USAETL Computer Sciences Laboratory STARAN array processor. Six figures detailing the analytic and data storage concepts discussed are given. An example illustrating the improved penetration possible from these methods is presented.1979-03-01T00:00:00ZFeature component reduction through divergence analysis
https://hdl.handle.net/11681/5076
Title: Feature component reduction through divergence analysis
Authors: Crombie, Michael A.; Friend, Nancy J.; Rand, Robert S.
Description: Research note; Abstract: An approach to developing a reduced set of texture-like descriptors is presented. Results of several experiments using multi-component vectors are presented including experiments with relaxation techniques to cleanse the test images. In view of these results, the practicality of using more complex feature vectors is questioned.1982-10-01T00:00:00ZParallel optical processing to convert elevation data to slope maps. Phase I, Theoretical analysis
https://hdl.handle.net/11681/5079
Title: Parallel optical processing to convert elevation data to slope maps. Phase I, Theoretical analysis
Authors: Brooke, Robert K.
Description: Research note; 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.1974-10-01T00:00:00ZSignal signatures of topographic features using analog technology
https://hdl.handle.net/11681/5078
Title: Signal signatures of topographic features using analog technology
Authors: Chen, Pi-Fuay; Seemuller, William W.
Description: Research note; Abstract: Signa1 signatures and signatures of various spectral decompositions of selected topographic features, such as line roads, road intersections, and rectangular buildings, were developed by using analog signal processing techniques. The signal signatures were constructed in the spatial domain, and the corresponding signatures of various spectral components were obtained in the Walsh transform domain. An electronic system for generating two-dimensional Walsh functions for decomposition of topographic features was designed and built. A scheme for detecting the decomposed spectral components using an analog processor was presented.1979-05-01T00:00:00Z