Density map visualization from motion sensors for monitoring activity level

This paper describes ongoing work in capturing and analyzing sensor data logged in the homes of seniors. Sensor networks have been deployed in TigerPlace apartments, to promote aging in place. Here, we introduce a visualization of the sensor data in the form of an activity density map which includes time away from home. The visualization is intended to aid caregivers in understanding the sensor data. In the density map, different colors are used to represent different levels of density in motion sensor data. For evaluating the activity density level accurately, time away from home was determined first using a system of fuzzy rules. Three case studies are included to illustrate how the density map can be used to track general activity level over time.