Institution: | 1.College of Geography and Environmental Science, Northwest Normal University, 967Anning East Road, Lanzhou, 730070, Gansu Province, China ;2.Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, 730070, China ;3.Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, China ;4.School of Urban Economics and Tourism Culture, Lanzhou City University, Lanzhou, 730070, Gansu, China ; |