1. Department of Geographic Information Science, School of Geographic Information and Tourism, Chuzhou University, Chuzhou, China
2. Anhui Province Key Laboratory of Physical Geographic Environment, Chuzhou University, Chuzhou, China
3. Anhui Center for Collaborative Innovation in Geographical Information Integration and Application, Chuzhou, China
4. Department of Geography, University of Wisconsin-Madison, Madison, WI, USA
5. Key Laboratory of Virtual Geographic Environment of Ministry of Education, Nanjing Normal University, Nanjing, China
6. Department of Geographic Information Science, College of Geographic Sciences, Nanjing Normal University, Nanjing, China