1. School of Geography and Remote Sensing Guangzhou University Guangzhou 510006 China
2. Faculty of Civil Engineering and Earth Sciences Delft University of Technology, P. O. Box 5048, 2600 Delft Netherlands
3. State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences Beijing 100101 China
4. Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458 China
5. Department of Land Surveying and Geo‐Informatics The Hong Kong Polytechnic University Kowloon Hong Kong
6. School of Geography and Planning Sun Yat‐sen University Guangzhou 510275 China