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88 Internet of Things Strategic Research and Innovation Agenda<br />

Fig. 2.30 Flow of information between real devices and virtual sensors or actuators [117].<br />

Fig. 2.31 Different levels for sensor virtualization.<br />

processing of several simple measurements (for example in a sensing node),<br />

and at the highest level, the abstract combination of different sensors at the<br />

application level (including user-generated virtual sensors).<br />

In that sense the development of virtual sensors could be approached following<br />

two different degrees of complexity:

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