Faculty of Geographical Science Beijing Normal University Beijing 100875 China;
Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China;
Faculty of Geographical Science Beijing Normal University Beijing 100875 China;
Faculty of Geographical Science Beijing Normal University Beijing 100875 China;
Faculty of Geographical Science Beijing Normal University Beijing 100875 China;
Faculty of Geographical Science Beijing Normal University Beijing 100875 China;