This work was partly supported by the National Key Research and Development Program [2018YFA0605504], the National Natural Science Foundation of China [41701500, 41601440, and 41601354], the Natural Science Foundation of Hunan Province [2018JJ3641], the Scientific Research Foundation for Distinguished Scholars, Central South University [502045001] and Project of Urban Spatial Information Infrastructure for Smart City, The Hong Kong Polytechnic University [1-ZEAB].
This work was partly supported by the National Key Research and Development Program [2018YFA0605504], the National Natural Science Foundation of China [41701500, 41601440, and 41601354], the Natural Science Foundation of Hunan Province [2018JJ3641], the Scientific Research Foundation for Distinguished Scholars, Central South University [502045001] and Project of Urban Spatial Information Infrastructure for Smart City, The Hong Kong Polytechnic University [1-ZEAB]. The authors would like to thank the editor-in-chief, the anonymous associate editor, and the reviewers for their insightful comments and suggestions.