The Location Stack

The Location Stack is a set of design abstractions for location systems for ubiquitous computing. Our contribution presented in this paper is twofold. First, the Location Stack design abstractions themselves give the ubiquitous computing community a common vocabulary and comparative framework for multi-sensor location systems. Second, our implementation of the Location Stack employs novel probabilistic techniques for fusing readings from multiple different sensor technologies while providing a uniform programming interface to applications. Our implementation is publicly available and supports many existing location technologies.