Algorithm 1 Computation of moving time
	Data: User’s trajectory data (pos = (x, y), array), timestamps (t, array)
	Results: Moving time (mv) feature
1	move_time_array ← [], i = 1
2	while i < length(pos) do
3		v ← √(posi(x) − posi-1(x))2 + (posi(y) − posi-1(y))2/(ti − ti−1)
4		if v > 0.2 then:
5			move_time_array ← (ti − ti−1)
6		end
7	end
8	mv ← mean(move_time_array)
9	end