I'd go for interpolation and take the current average speed and the "structure" of the streets into account. That of course only works when you have something like a graph / vector representation of the streets and know how they are connected and what orientation they have.
It is also pretty common that even Google Navigation is off, especially on highways with exits. Sometimes the navigation draws the car following the highway even though you are already leaving on an exit. On Wednesday, August 1, 2012 9:18:33 AM UTC-5, bushido wrote: > > Hi all, > > I'm writing an application for android for which I need good position > accuracy, I use a Galaxy Nexus as test device. > > My test application subscribes to location updates and draws a car > symbol in a map, the map is centered to the location of the car & > rotates according to the bearing of the location (exactly like google > maps on android does). I noticed that when up to speed, the positions > don't match with reality, they lag behind considerably. > When I cross a street at 90km/h for example, it will take a few > seconds before the car on the map is also crossing that street. It > isn't an error in the map data, because when I'm standing still, the > car gets drawn on the correct location. Google maps for android shows > exactly the same behavior. > > The position of the car in Google Navigate on the other hand matches > reality rather closely. I've noticed that the position updates are a > lot smoother as well. (10Hz rather than the 1Hz updates which you get > from GPS) > > My question is: how do they do it? What I can think of is: > - using the phone's sensors (gyro & accelero) together with a kalman > filter or similar. But I can't see how you could make that work for > every phone, since not all phones have these sensors. > - interpolating, but in that case I would expect overshooting when > there is a sudden stop or a sharp corner > > Thanks in advance. > Bushido > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
