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ISPRS Int. J. Geo-Inf. 2016, 5(11), 204; doi:10.3390/ijgi5110204

Uncertainty-Based Map Matching: The Space-Time Prism and k-Shortest Path Algorithm

1
UHasselt–Hasselt University and transnational University Limburg, Databases and Theoretical Computer Science Research Group, Agoralaan, Diepenbeek 3590, Belgium
2
VikingCo, Hasselt 3500, Belgium
3
Instituto Tecnológico de Buenos Aires 1106, Argentina
*
Author to whom correspondence should be addressed.
Academic Editor: Wolfgang Kainz
Received: 5 September 2016 / Revised: 27 October 2016 / Accepted: 4 November 2016 / Published: 10 November 2016
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Abstract

Location-aware devices can be used to record the positions of moving objects for further spatio-temporal data analysis. For instance, we can analyze the routes followed by a person or a group of people, to discover hidden patterns in trajectory data. Typically, the positions of moving objects are registered by GPS devices, and most of the time, the recorded positions do not match the road actually followed by the object carrying the device, due to different sources of errors. Thus, matching the moving object’s actual position to a location on a digital map is required. The problem of matching GPS-recorded positions to a road network is called map matching (MM). Although many algorithms have been proposed to solve this problem, few of them consider the uncertainty caused by the absence of information about the moving object’s position in-between consecutive recorded locations. In this paper, we study the relationship between map matching and uncertainty, and we propose a novel MM algorithm that uses space-time prisms in combination with weighted k-shortest path algorithms. We applied our algorithm to real-world cases and to computer-generated trajectory samples with a variety of properties. We compare our results against a number of well-known algorithms that we have also implemented and show that it outperforms existing algorithms, allowing us to obtain better matches, with a negligible loss in performance. In addition, we propose a novel accuracy measure that allows a better comparison between different MM algorithms. We applied this novel measure to compare our algorithm against existing algorithms. View Full-Text
Keywords: map matching; trajectory and moving object data; space-time prism; k-shortest path algorithm map matching; trajectory and moving object data; space-time prism; k-shortest path algorithm
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Kuijpers, B.; Moelans, B.; Othman, W.; Vaisman, A. Uncertainty-Based Map Matching: The Space-Time Prism and k-Shortest Path Algorithm. ISPRS Int. J. Geo-Inf. 2016, 5, 204.

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