Indoor Location: Ground Truth

The BESIDE project is building an understanding of the behaviour of residents in care homes. Part of this understanding requires a record of the location of residents as they move around the care home. The BESIDE team are investigating various technologies to provide this indoor location, but how do we evaluate the accuracy of these technologies? Some method of comparing the location data with a known "ground truth" is required.

Normally in indoor location systems, this ground truth is provided by human observation, in other words a human is present during the technology development stage (or using video data in post processing) to confirm measurements, either by making measurements by hand or by using environmental cues (such as a floor grid). The BESIDE has attempted to improve this process, firstly by using accurate laser disto technology to collect precise measurements, and also to automate all or part of the process.

For example, the latest Laser Disto technology (in the form of the 3D Laser Disto from Leica) provides automated room scanning measurements, reducing significantly the amount of human interaction required to gather measurements. Early results show that using this kind of technology gives accurate ground truth data with minimal human effort, and provides a useful tool in evaluating the accuracy of indoor location technologies.

 

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