Reduce GPS data error on Android with Kalman filter and accelerometer

Re:Reduce GPS data error on Android with Kalman filter and a... by IshKebab on Tuesday March 20, 2018 @07:44AM (#16627658)

Converting coordinates to string-based hashes is quite weird. Why not just find which grid square they are in and used the flat index of it?

[ Parent | on HN ]

Re:Reduce GPS data error on Android with Kalman filter and a... by tuukkah on Tuesday March 20, 2018 @12:03PM (#16629754)

Hmm, you don't have to convert the geohash to a (base-32) string - int64 may be just as fine.

Perhaps they can take advantage of the better locality of Z index compared to flat index, and/or they want to store higher precision and do lookups with varying precisions (grid sizes)?

[ Parent | on HN ]

Re:Reduce GPS data error on Android with Kalman filter and a... by Gen1us2k on Wednesday March 21, 2018 @01:29AM (#16635709)

We use geohash because it's really fast and we can control precision. We don't need to store any information about grid and we don't need to convert coordinates to spherical view.

[ Parent | on HN ]