alt Hacker NewsHard to get a gps fix indoors. My guess is to infer it from OTA tv channel IDs and relative signal strengths. Wouldn’t need a big database and the transmitters don’t move much.
See “datacasting” for data side. Would be 1-way so hard to know how many eye/ear balls get the noise; I mean; ad.
Couldn't you still get a reliable GPS fix by observing over longer time periods? But it requires a relatively expensive hardware component so geolocating via nearby wifi APs would definitely be cheaper. Google offers a convenient API for that and there's a semi-public database over at WiGLE.
https://developers.google.com/maps/documentation/geolocation...
https://wigle.net/