1. School of Urban and Environment Sciences, Xuchang University, Xuchang, China
2. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
3. School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing, China
4. School of Electrical and Mechanical Engineering (Engineering Training Center), Xuchang University, Xuchang, China
5. State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China