1. Department of Geography & Environmental Management, University of Waterloo, Waterloo, ON, Canada N2L 3G1
2. Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, School of Information Science and Engineering, Xiamen University, Xiamen, Fujian 361005, China
3. Changjiang Spatial Information Technology Engineering Company, Changjiang Institute of Survey Planning Design and Research, Wuhan, Hubei 430010, China
4. School of Remote Sensing Information & Engineering, Wuhan University, Wuhan, Hubei 430079, China