[alephxyz]

Ultrasonic beacon tracking + being able to tell if someone is indoors, in a vehicle, at a concert, sporting event, watching something on tv, etc

[SketchySeaBeast]

I would expect that you could tell if someone was indoors, in a vehicle, at a concert, or sporting event based upon the content of the photo.

[bastawhiz]

Most photos have a timestamp and geotag. Knowing whether you're in a vehicle, at a concert or sporting event, or really doing just about anything can be gathered from that information as well as whatever the photos is of. One second of audio isn't giving much (additional) useful data.