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Chapter 6
Boundary Detection for Sensor Networks
Ren-Shiou Liu, Lifeng Sang, and Prasun Sinha
Computer Science and Engineering
Ohio State University, Columbus, OH 43210
{rsliu, sangl, prasun}@cse.ohio-state.edu
1 Introduction
Wireless sensor networks have a variety of applications, such as environment
monitoring, structural monitoring, remote exploration, condition-based maintenance,
commercial surveillance, and national asset protection. These applications
require the network to monitor a certain type of non-local spatiotemporal
phenomenon, collaboratively process gathered information, and respond
to external events or report results. There are di?®erent types of phenomenon
that can be observed by a network of sensors. For some phenomena such as
fire, gas leak, chemical attack and biological attack, it is critical to track the
boundary of the a?®ected area.
An example scenario is illustrated in Figure 1. When a battle field is
attacked by chemical or biological weapons, it is desirable to know which
areas are covered by the toxic plumes so that e?®ective decisions for evacuation
and rescue operations can be made in real time. To do that, UAVs may be
directed to the battle field to spread chemical sensors over the air. As soon as
sensors land in the field, they self-organize into an ad-hoc network and start
sensing, gathering requested information and sending them back to the sink
for decision making.
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