In general, a person’s home can be identified by tracking the movement of their mobile phone. At night it is at rest when the person sleeps. Alternatively, turn

In general, a person’s home can be identified by tracking the movement of their mobile phone. At night it is at rest when the person sleeps. Alternatively, turning the phone off and a few hours later back on in the same location. If you use maps you can correlate it with businesses and homes. Governments could ask telcos for this data (a log of when and where which phones connected to a cell). Or just the general workload of cell towers compared to previous weeks gives you a rough estimation of where phones are and are not. You could also ask for broadband activity and compare it to previous activity. If people evacuated, their bandwidth usage should have flatlined.