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The fight against the COVID-19 pandemic has highlighted the importance and benefits of recommending paths that reduce the exposure to and the spread of the SARS-CoV-2 coronavirus by avoiding crowded indoor or outdoor areas. Existing path discovery techniques are inadequate for coping with such dynamic and heterogeneous (indoor and outdoor) environments—they typically find an optimal path assuming a homogeneous and/or static graph, and hence they cannot be used to support contact avoidance. In this article, we pose the need forMobile Contact Avoidance Navigation and proposeASTRO (A ccessibleS patio-T emporalR outeO ptimization), a novel graph-based path discovering algorithm that can reduce the risk of COVID-19 exposure by taking into consideration the congestion in indoor spaces.ASTRO operates in an A* manner to find the most promising path for safe movement within and across multiple buildings without constructing the full graph. For its path finding,ASTRO requires predicting congestion in corridors and hallways. Consequently, we propose a new grid-based partitioning scheme combined with a hash-based two-level structure to store congestion models, calledCM-Structure , which enables on-the-fly forecasting of congestion in corridors and hallways. We demonstrate the effectiveness ofASTRO and the accuracy ofCM-Structure ’s congestion models empirically with realistic datasets, showing up to one order of magnitude reduction in COVID-19 exposure.

ASTRO: Reducing COVID-19 Exposure through Contact Prediction and Avoidance