1. Lecturer, Faculty of Civil Engineering, Institute of Research and Development, Duy Tan Univ., P809-03 Quang Trung, Danang 550000, Vietnam (corresponding author).
2. Lecturer, Faculty of Civil Engineering, Duy Tan Univ., P202-03 Quang Trung, Danang 550000, Vietnam.
3. Associate Professor, Geographic Information Science Research Group, Dept. of Business and Computer Science, Univ. College of Southeast Norway, Gullbringvegen 36, N-3800, Bø i Telemark, Norway; formerly, Geographic Information Science Research Group, Ton Duc Thang Univ., Ho Chi Minh City, Vietnam.