State Key Laboratory of Resources and Environmental Information System;
Institute of Geographic Sciences and Natural Resources Research;
CAS;
Beijing 100101;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application;
Nanjing 210023;
China;
Collaborative Innovation Center of South China Sea Studies;
Nanjing 210093;
China;
geomorphological regionalization; geomorphological types; hierarchical system; China;