《Table 2 Statistics of degree of relief for the prefec-ture-level cities in China》

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《中国1km地形起伏度数据集》

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At the county level，relief degree of land surface for most Chinese counties is low.When the value reaches 0.5，the cumulative frequency of the number ofcounties reaches 51.76%.When the value reaches 1，the cumulative frequency of the number of counties reaches 66.17%.When the value reaches 2，and 3，the cumulative frequency of the number of counties has reaches 85.90%and 91.48%，respectively（Figure 4）.