Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
I know satellites can make out cities not even the visible spectrum satellites.
Now that I think about it there are lots of wireless devices. If you have a living room TV you could block that. Obvious mesh network nodes can have their signal blocked. Also your phone can move closer too and further away from wireless router
Yeah I could see it if you have enough data you could at least check node proximity, but floor plan mapping might be different