Global Sensor Networks (GSN) de nes both the project and the software describedin this document. A Wrapper (Wrapper) is a piece of Java code that does the data acquisition for aspeci c type of device. A Virtual Sensor (VS) is the main component in GSN. It receives data from one ormore Wrapper. It can combine their data, process and nally store it. A VS is de nedin a single VSD and combines di erent pieces of software{ One VSP{ Zero or Many Wrapper (s) A Virtual Sensor Description le (VSD) is an XML le that contains the selectionand the parametrization of the VSP and Wrapper that compose a VS. This le alsocontains the SQL statements that connect them together. A Virtual Sensor Processing class (VSP) is a piece of Java code that process andstores the data upon reception from the Wrapper.1.2 Quick StartGSN
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