中国高等级旅游景区资源多尺度时空差异及其影响因素
张广海, 袁洪英, 段若曦, 董跃蕾

Multiscale analysis of the spatiotemporal differences and the influencing factors of the high-level tourist attractions in China
ZHANG Guang-hai, YUAN Hong-ying, DUAN Ruo-xi, DONG Yue-lei
图4 中国高等级旅游景区资源核密度分布变化
Fig. 4 The change of kernel density distribution of high-level tourist attractions in China