1. Institute for Cartography, Department of GeosciencesDresden University of Technology Dresden Germany
2. Department of Civil EngineeringUniversiti Putra Malaysia 43400, UPM Serdang Malaysia
3. Department of Energy and Mineral Resources Engineering, Choongmu‐gwanSejong University 209 Neungdong‐ro Gwangjin‐gu Seoul 05006 Korea