4 ms·

I'm curious to know where one gets such "heigh-support" data from?

• gravypod 8y ago
  If I worked in the advertisement space I'd probably install WiFi networks that could broadcast SSIDs at known mac addresses that are coded to a height. I could install apps on user phones that could read that and pull out height & building name data.
• joshvm 8y ago
  GPS gives you a 3D fix (lat/lon/height). A common use case in aviation, particularly drones, is avoiding controlled airspace. The height of controlled airspace varies with location - for example a rural area might be 7500ft while near an airport traffic zone it might be only 1000ft or lower.
  • gravypod 8y ago
    GPS isn't too great in skyscrapers. In most current gen smartphones GPS can only really pin you to a 16ft resolution on a current gen smartphone in ideal conditions [0]. This gets worse indoors and if the target is moving. [0] - https://www.gps.gov/systems/gps/performance/accuracy/ https://www.gps.gov/systems/gps/performance/accuracy/
    • sbr464 8y ago
      It wouldn’t necessarily need to come from GPS. You could use beacons (ble) or similar to augment the raw dataset. https://estimote.com https://estimote.com (etc)
    • joshvm 8y ago
      For airspace it doesn't matter too much. Allowable Mode-C accuracy is something more than 100 feet (I think) to allow for poor sensors, and controllers simply add a buffer.