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Open AccessArticle

Efficient, Decentralized Detection of Qualitative Spatial Events in a Dynamic Scalar Field

1
CyberGIS Center for Advanced Digital and Spatial Studies,University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
2
School of Mathematical and Geospatial Sciences, RMIT University, Melbourne,Victoria 3000, Australia
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Authors to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Sensors 2015, 15(9), 21350-21376; https://doi.org/10.3390/s150921350
Received: 25 June 2015 / Revised: 3 August 2015 / Accepted: 20 August 2015 / Published: 28 August 2015
(This article belongs to the Section Sensor Networks)
This paper describes an efficient, decentralized algorithm to monitor qualitative spatial events in a dynamic scalar field. The events of interest involve changes to the critical points (i.e., peak, pits and passes) and edges of the surface network derived from the field. Four fundamental types of event (appearance, disappearance, movement and switch) are defined. Our algorithm is designed to rely purely on qualitative information about the neighborhoods of nodes in the sensor network and does not require information about nodes’ coordinate positions. Experimental investigations confirm that our algorithm is efficient, with O(n) overall communication complexity (where n is the number of nodes in the sensor network), an even load balance and low operational latency. The accuracy of event detection is comparable to established centralized algorithms for the identification of critical points of a surface network. Our algorithm is relevant to a broad range of environmental monitoring applications of sensor networks. View Full-Text
Keywords: geosensor networks; decentralized spatial computing; surface networks; critical points; coordinate-free algorithm; spatial event detection; environmental monitoring geosensor networks; decentralized spatial computing; surface networks; critical points; coordinate-free algorithm; spatial event detection; environmental monitoring
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Jeong, M.-H.; Duckham, M. Efficient, Decentralized Detection of Qualitative Spatial Events in a Dynamic Scalar Field. Sensors 2015, 15, 21350-21376.

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