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An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks

Authors :
Keun Ho Ryu
Thi Hong Nhan Vu
Su Wook Ha
Yang Koo Lee
Young Jin Jung
Source :
Sensors, Vol 12, Iss 4, Pp 3997-4015 (2012)
Publication Year :
2012
Publisher :
MDPI AG, 2012.

Abstract

In a wireless sensor network, sensors collect data about natural phenomena and transmit them to a server in real-time. Many studies have been conducted focusing on the processing of continuous queries in an approximate form. However, this approach is difficult to apply to environmental applications which require the correct data to be stored. In this paper, we propose a weather monitoring system for handling and storing the sensor data stream in real-time in order to support continuous spatial and/or temporal queries. In our system, we exploit two time-based insertion methods to store the sensor data stream and reduce the number of managed tuples, without losing any of the raw data which are useful for queries, by using the sensors’ temporal attributes. In addition, we offer a method for reducing the cost of the join operations used in processing spatiotemporal queries by filtering out a list of irrelevant sensors from query range before making a join operation. In the results of the performance evaluation, the number of tuples obtained from the data stream is reduced by about 30% in comparison to a naïve approach, thereby decreasing the query execution time.

Details

Language :
English
ISSN :
14248220
Volume :
12
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.15c0be79a4e24d1e88d9a5d52a0c21fa
Document Type :
article
Full Text :
https://doi.org/10.3390/s120403997