An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks
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...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
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MDPI AG
2012-03-01
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Series: | Sensors |
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Online Access: | http://www.mdpi.com/1424-8220/12/4/3997/ |
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author | Keun Ho Ryu Thi Hong Nhan Vu Su Wook Ha Yang Koo Lee Young Jin Jung |
author_facet | Keun Ho Ryu Thi Hong Nhan Vu Su Wook Ha Yang Koo Lee Young Jin Jung |
author_sort | Keun Ho Ryu |
collection | DOAJ |
description | 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. |
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format | Article |
id | doaj.art-15c0be79a4e24d1e88d9a5d52a0c21fa |
institution | Directory Open Access Journal |
issn | 1424-8220 |
language | English |
last_indexed | 2024-04-11T11:13:41Z |
publishDate | 2012-03-01 |
publisher | MDPI AG |
record_format | Article |
series | Sensors |
spelling | doaj.art-15c0be79a4e24d1e88d9a5d52a0c21fa2022-12-22T04:27:19ZengMDPI AGSensors1424-82202012-03-011243997401510.3390/s120403997An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor NetworksKeun Ho RyuThi Hong Nhan VuSu Wook HaYang Koo LeeYoung Jin JungIn 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.http://www.mdpi.com/1424-8220/12/4/3997/wireless sensor networksenor data streamspatiotemporal continuous query processingdata stream management system |
spellingShingle | Keun Ho Ryu Thi Hong Nhan Vu Su Wook Ha Yang Koo Lee Young Jin Jung An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks Sensors wireless sensor network senor data stream spatiotemporal continuous query processing data stream management system |
title | An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks |
title_full | An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks |
title_fullStr | An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks |
title_full_unstemmed | An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks |
title_short | An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks |
title_sort | environmental monitoring system for managing spatiotemporal sensor data over sensor networks |
topic | wireless sensor network senor data stream spatiotemporal continuous query processing data stream management system |
url | http://www.mdpi.com/1424-8220/12/4/3997/ |
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