1. National Engineering Research Center for Geographic Information System, School of Geography, China University of Geosciences, Wuhan 430074, China
2. School of Computer Science, China University of Geosciences, Wuhan 430074, China
3. State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing (LIESMARS), Wuhan University, Wuhan 430079, China
4. School of Civil and Environmental Engineering, University of Engineering and Technology, Peshawar Campus III Bannu, Bannu 28100, Pakistan