Data fusion in observer networks

Sensor networks (SN) and wireless sensor networks (WSN) are one of key technologies in development for 21 century, challenging the imagination of scientists and engineer because when deployed directly in an area of interest a large volume of data can be obtained. Increasing the volume of data, we must create robust software support for data collecting and utilization. In those cases sensor network with more powerful data processing has to be used. We have introduced such a network using the term "observer network". The papers main topic is data fusion in observer network performed on different levels of observer network architecture. As an example of observer network a part of iForestFire, the advanced forest fire monitoring system is discussed.