Something I noticed when driving around.
My phone’s GPS usually does a great job at telling what lane I’m on and how far I am to an intersection, but it does a terrible job at telling if I’m on or under an elevated expressway.
Why can it tell my horizontal position so much better than my vertical position?
The phenomenon is independent to the model and make of the phone as well. I’ve switched from Android to Apple, and both phones seem to be terrible at telling if I’m on an elevated expressway or on the road under it.
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The GPS feature establishes your position in three dimensions. Often with less accuracy when it comes to height.
But the problem is often that the map program doesn’t care if you are on or under a bridge. Or that the map is poorly digitalised. Or that the map program sucks at deciding which level you were on when you entered the “intersection”.
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