Algorithm 2. LocationHistoryModeling
Input: Collection of users GPS logs, userLogs
Output: Tree-Based Hierarchical Graph (TBHG)
1	Foreach user do
2	trajectory = LogParsing(userLogs);
3	S = StayPointDetection(trajectory);
4	LocH = PersonalLocHis(S); //individual user
5	SP.add(S);   //collection of stay points
6	H = HierarchicalClustering(SP);
7	Foreach level do //build a graph on each level
8	Foreach user do
9	g = graphBuilding(g, LocH);
10	G.add(g);
11	TBHG = (H, G);
12	Return TBHG;