Choosing landmarks for risky planning
Murphy, Elizabeth, Corke, Peter, & Newman, Paul (2011) Choosing landmarks for risky planning. In Amato, Nancy M. (Ed.) Proceedings of the 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems, IEEE, Hilton San Francisco, San Francisco, CA, pp. 3868-3873.
This work examines the effect of landmark placement on the efficiency and accuracy of risk-bounded searches over probabilistic costmaps for mobile robot path planning. In previous work, risk-bounded searches were shown to offer in excess of 70% efficiency increases over normal heuristic search methods. The technique relies on precomputing distance estimates to landmarks which are then used to produce probability distributions over exact heuristics for use in heuristic searches such as A* and D*. The location and number of these landmarks therefore influence greatly the efficiency of the search and the quality of the risk bounds. Here four new methods of selecting landmarks for risk based search are evaluated. Results are shown which demonstrate that landmark selection needs to take into account the centrality of the landmark, and that diminishing rewards are obtained from using large numbers of landmarks.
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|Item Type:||Conference Paper|
|Keywords:||Accuracy, Approximation Methods, Gaussian Distribution, Path Planning, Planning, Probabilistic Logic, Probability Distribution|
|Subjects:||Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > ARTIFICIAL INTELLIGENCE AND IMAGE PROCESSING (080100) > Adaptive Agents and Intelligent Robotics (080101)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Engineering Systems
|Copyright Owner:||Copyright 2011 IEEE. All rights reserved.|
|Copyright Statement:||Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.|
|Deposited On:||21 Nov 2011 09:38|
|Last Modified:||31 Aug 2012 05:22|
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