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根据保护煤柱留设原理，指出现在常用的数字标高投影法留设保护煤柱的不足之处，并提出了改进方法。
According to the principle of preserving pillar of coal pillar, this paper points out the shortcomings of the current commonly used digital elevation projection method to set up pillar of coal pillar and proposes an improved method.