The labels of datasets have following meanings:

sid : Sensor Id of sensor which produced the event

ts : Timestamp value

x, y, z : Position of sensor

|v| : Velocity

vx, vy, vz : Metric used in velocity calculation. Read [1]

|a| : Acceleration

ax, ay, az : Absolute acceleration in respective direection

[1] Using vx, vy, vz velocity in directions x,y and z can be calculated as, v’x = |v| * vx * 1e-4 * 1e-6