1. School of Computer Science, Hangzhou Dianzi University, Hangzhou 310018, China
2. Anhui Province Key Laboratory of Physical Geographic Environment, Chuzhou University, Chuzhou 239000, China
3. Anhui Engineering Laboratory of Geo-Information Smart Sensing and Services, Chuzhou 239000, China
4. Anhui Center for Collaborative Innovation in Geographical Information Integration and Application, Chuzhou 239000, China