Sensor technology is continuously improving as the devices become smaller, cheaper, more intelligent, and more power efficient. In consequence, more and more application fields are making use of these technologies. Examples are disaster management, environmental thoroughly monitoring, precision agriculture, Inhibitors,Modulators,Libraries early warning systems, home as well as public security, or human health [4�C6]. The kinds of sensor resources utilized in these applications may be stationary or in motion and could gather data in an in-situ or remote manner. Due to the large variety of sensor protocols and sensor interfaces, most applications are Inhibitors,Modulators,Libraries still integrating sensor resources through proprietary mechanisms, instead of building upon a well-defined and established integration layer.

This manual bridging between sensor resources and applications leads Inhibitors,Modulators,Libraries to extensive adaption effort, and is a key cost factor in large-scale deployment scenarios [7].This issue has been the driving force for the Open Geospatial Consortium (OGC) to start the Sensor Web Enablement (SWE) initiative (http://www.ogcnetwork.net/swe) back in 2003. Within the SWE working group a suite of standards has been developed which can be used as building blocks for a Sensor Web. SWE defines the term Sensor Web as ��Web accessible sensor networks and archived sensor data that can be discovered and accessed using standard protocols and application programming interfaces�� [8]. First described by Delin et al. in 1999 [9], a Sensor Web was considered as an autonomously organized wireless sensor network which can be deployed to monitor environments.

As a smart macro instrument for coordinated sensing [10], Delin��s Sensor Web concept consists of sensor nodes Inhibitors,Modulators,Libraries which not only collect data, but also share their GSK-3 data and adjust their behaviour based on that data. Thereby, the term ��Web�� within Delin��s ��Sensor Web�� relates to the intelligent coordination of the network rather than the World Wide Web (WWW) [11]. Later, the meaning of ��Sensor Web�� changed and it was more and more seen as an additional layer integrating sensor networks with the WWW and applications [12�C14]. Today, the notion of ��Sensor Web�� has been largely influenced by the developments of the SWE initiative. It is defined as an infrastructure which enables an interoperable usage of sensor resources by enabling their discovery, access, tasking, as well as eventing and alerting within the Sensor Web in a standardized way.

Thus, the Sensor Web is to sensor resources what the WWW is to general information sources��an infrastructure allowing users to easily share their sensor resources in a well-defined way [15]. It hides the underlying layers, the network communication details, and heterogeneous sensor hardware, from the applications built on top of it.To achieve selleck chemicals Tofacitinib this, SWE incorporates models for describing sensor resources and sensor observations.