1. School of Geography and Information Engineering, China University of Geosciences, Wuhan, Hubei Province, China
2. Geographic Information Department, Shaoxing Geotechnical Investigation & Surveying Insititute, Shaoxing, Zhejiang Province, China
3. National Engineering Research Center of Geographic Information System, China University of Geosciences, Wuhan, Hubei Province, China
4. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, Hubei Province, China