3 ms·
Why does the acceleration graph not take direction into account? Seems like you could get much cleaner data if you looked only at the directions orthogonal to
by aeternum 2y ago
Why does the acceleration graph not take direction into account? Seems like you could get much cleaner data if you looked only at the directions orthogonal to gravity.
- kaonwarb 2y agoThey're using Fourier transforms to focus on frequencies of acceleration associated with subway travel; gravity should mostly fall out as an independent factor.
- nickmooney 2y agoIs there always a great reference for which way down is, given that the phone can be in various orientations? You might have to do some other heuristics / build some other model for that to figure out which axis to subtract your 9.8 m/s^2 from - maybe it's easier not to worry about it.
- zokier 2y agoIsn't merging gyro data with accelerometer data pretty standard approach?
- nickmooney 2y agoI forgot phones have gyroscopes :)