Table 3.
Description of the features.
| Feature | Source | Description |
|---|---|---|
| speed | GPS | Speed from GPS, converted to km/h. |
| speedChange | GPS | Difference in speed from previous GPS measurement. |
| accelVariance | accelerometer | Variance in the norm of the acceleration (Equation (4)) over the moving window. |
| headingChange | GPS | Sum of absolute value of heading changes over the moving window. |
| accuracy | GPS | Accuracy rating from GPS, assumed to be meters of horizontalerror. |
| trainDistance | GPS/GIS | Distance to the nearest train station in meters. |
| busDistance | GPS/GIS | Distance to the nearest bus stop in meters. |
| 1 HzPeak | accelerometer | Strength of 10-Hz peak in FFT of the accelVariance signal. |