CAPRA: A contour-based accessible path routing algorithm

Rahaman, M, Mei, Y, Hamilton, M and Salim, F 2017, 'CAPRA: A contour-based accessible path routing algorithm', Information Sciences, vol. 385386, pp. 157-173.


Document type: Journal Article
Collection: Journal Articles

Title CAPRA: A contour-based accessible path routing algorithm
Author(s) Rahaman, M
Mei, Y
Hamilton, M
Salim, F
Year 2017
Journal name Information Sciences
Volume number 385386
Start page 157
End page 173
Total pages 17
Publisher Elsevier
Abstract Existing journey planners and route recommenders mainly focus on calculating the shortest path with minimum distance or travel time. However, elderly people and those with special needs (i.e. those in wheelchairs or walking with sticks) often prefer a safer and more gentle journey. Given that their route options are affected by accessibility issues such as climbing a steep slope, it is important to design a journey planner that takes in to account the accessibility of the route, as well as the standard metrics, such as travel time and distance. Accessibility has not been explored widely in path finding problems. There are two key challenges for computing accessibility. First, the accessibility of a route is not well-defined. Second, the accessibility of a route varies from user to user. In this paper, a new algorithm is designed to tackle the above two challenges. Two metrics are defined to reflect the accessibility of a route, in terms of the total vertical distance and the maximum slope. Then, a multi-objective A* search algorithm is designed to obtain a set of Pareto-optimal routes in terms of the total distance covered and the two accessibility metrics. The user can then choose from the routes provided by the new algorithm, the most suitable one according to their own preferences. The experimental results show that the proposed algorithm is able to provide a diverse set of routes with different accessibility options, including the shortest path which does not consider any accessibility metrics. In other words, the new journey planner can satisfy the preferences of a wide range of users including both the healthy and those with special needs.
Subject Global Information Systems
Ubiquitous Computing
Keyword(s) Accessible path
Journey planning
Multi-objective A* algorithm
Path routing
Route ranking
DOI - identifier 10.1016/j.ins.2016.12.041
Copyright notice © 2017 Elsevier
ISSN 0020-0255
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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