4 ms·
I live in San Francisco. We don't exactly have the tallest buildings, but I can assure you from years of tracking runs in the downtown area here and nearby fore
by s1mon 4y ago
I live in San Francisco. We don't exactly have the tallest buildings, but I can assure you from years of tracking runs in the downtown area here and nearby forested areas, GPS gets very screwed up unless it has a clear view of the sky. This is with a variety of Garmins, Apple iPhones and Apple Watch. I'm looking forward to the newer devices with L5.
- londons_explore 4y agoIt's known as the 'urban canyon' effect. It can be significantly reduced if the GPS has access to a 3d model of the nearby buildings - then the GPS can guess which signals are probably reflections and which are direct. Alas, I think this isn't done outside data centers/labs, because the data download to have a large 3d model to get a GPS fix isn't a service anyone wants to run for free.
- sorenjan 4y agoUber showed this in 2018, I don't know how widely used it is now. I doubt any phone app uses it offline at least. https://www.uber.com/en-SE/blog/rethinking-gps/ https://www.uber.com/en-SE/blog/rethinking-gps/
- netheril96 4y agoGiven how many Android phones already have this, maybe you could borrow one and compare? I want to know the answer.