To evaluate the impact of various weights assigned to different map layers, we used two sets of weights for map layer aggregations on the client side: Profile 1: W1=W2=W3=W4=1; and Profile 2: W1=0.1, W2=0.4, W3=0.3, and W4=0.2 as mentioned in Section 4.1. Figure 15 shows two risk profiles for room 326 over 40 min from 20:00 to 20: 40 p.m. on 11 June 2020.