mschwett
Well-Known Member
- Region
- USA
spent some time zooming around my strava heat map just now, and it's really impressive how accurate mobile positioning is these days. these are from around 10k miles of riding, and in several cases these are probably hundreds of tracks in the same place... you can see u-turns, taking one side of the road vs another, the little wiggle around the massive steel towers of the golden gate bridge, little deviations onto a side street to go around a red!
golden gate park:
approaches to the golden gate bridge. a few errant traces here! the interesting fan shape at the very bottom is the sharp turn at the end of a very fast descent. the actual route is the right wiggly line, so obviously there's some "road snapping" going on in the location services, and the moment it realizes it's wrong seems to vary by quite a bit, perhaps due to sampling rate? speed going into the spot where it splits is 35-40mph typically.
and here's the worst case scenario around here, surrounded by tall (100-300m) buildings. i'm guessing wifi positioning and other assisted GPS techniques are more at play here than the true satellite reading, when the southern sky is hardly visible.
anyone have any cool GPS trace oddities or patterns?
golden gate park:
approaches to the golden gate bridge. a few errant traces here! the interesting fan shape at the very bottom is the sharp turn at the end of a very fast descent. the actual route is the right wiggly line, so obviously there's some "road snapping" going on in the location services, and the moment it realizes it's wrong seems to vary by quite a bit, perhaps due to sampling rate? speed going into the spot where it splits is 35-40mph typically.
and here's the worst case scenario around here, surrounded by tall (100-300m) buildings. i'm guessing wifi positioning and other assisted GPS techniques are more at play here than the true satellite reading, when the southern sky is hardly visible.
anyone have any cool GPS trace oddities or patterns?
