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A Trajectory Calculus for Qualitative Spatial Reasoning Using Answer Set Programming

Published online by Cambridge University Press:  10 August 2018

GEORGE BARYANNIS
Affiliation:
University of Huddersfield, UK (e-mails: [email protected], [email protected], [email protected], [email protected])
ILIAS TACHMAZIDIS
Affiliation:
University of Huddersfield, UK (e-mails: [email protected], [email protected], [email protected], [email protected])
SOTIRIS BATSAKIS
Affiliation:
University of Huddersfield, UK (e-mails: [email protected], [email protected], [email protected], [email protected])
GRIGORIS ANTONIOU
Affiliation:
University of Huddersfield, UK (e-mails: [email protected], [email protected], [email protected], [email protected])
MARIO ALVIANO
Affiliation:
University of Calabria, Italy (e-mail: [email protected])
TIMOS SELLIS
Affiliation:
Swinburne University of Technology, Australia (e-mails: [email protected], [email protected])
PEI-WEI TSAI
Affiliation:
Swinburne University of Technology, Australia (e-mails: [email protected], [email protected])
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Abstract

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Spatial information is often expressed using qualitative terms such as natural language expressions instead of coordinates; reasoning over such terms has several practical applications, such as bus routes planning. Representing and reasoning on trajectories is a specific case of qualitative spatial reasoning that focuses on moving objects and their paths. In this work, we propose two versions of a trajectory calculus based on the allowed properties over trajectories, where trajectories are defined as a sequence of non-overlapping regions of a partitioned map. More specifically, if a given trajectory is allowed to start and finish at the same region, 6 base relations are defined (TC-6). If a given trajectory should have different start and finish regions but cycles are allowed within, 10 base relations are defined (TC-10). Both versions of the calculus are implemented as ASP programs; we propose several different encodings, including a generalised program capable of encoding any qualitative calculus in ASP. All proposed encodings are experimentally evaluated using a real-world dataset. Experiment results show that the best performing implementation can scale up to an input of 250 trajectories for TC-6 and 150 trajectories for TC-10 for the problem of discovering a consistent configuration, a significant improvement compared to previous ASP implementations for similar qualitative spatial and temporal calculi.

Type
Original Article
Copyright
Copyright © Cambridge University Press 2018 

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