• ZHANG Zhigang

  ZHANG Zhigang

  1 School of Geographical Sciences, Nanjing Normal University, Nanjing 210023, China.2 Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China.3 State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
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• WANG Jian

  WANG Jian

  1 School of Geographical Sciences, Nanjing Normal University, Nanjing 210023, China.2 Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China.4 Key Laboratory of Virtual Geographical Environment, Nanjing Normal University, Nanjing 210023, China.
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• XU Xiaobin

  XU Xiaobin

  5 School of Urban and Resource Environment, Jiangsu Second Normal University, Nanjing 210013, China.
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• BAI Shibiao

  BAI Shibiao

  1 School of Geographical Sciences, Nanjing Normal University, Nanjing 210023, China.2 Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China.4 Key Laboratory of Virtual Geographical Environment, Nanjing Normal University, Nanjing 210023, China.
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• CHANG ZhiYang

  CHANG ZhiYang

  6 Nanjing Institute of Tourism and Hospitality, Nanjing 211100, China
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This work was supported by the National Natural Science Foundation of China (Grant No. 40572097), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) (Grant No. 164320H116), and by the Yulong Mountain tourism development and management committee special project. We are also grateful to the two anonymous reviewers for their constructive comments.