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推导了严密的视距平距计算公式,据此对两个近似公式的近似性及对大比例尺地形测图的影响进行了分析,所得结论有助于视距公式在实际工作中的应用。
Based on this, the approximate formulas of two approximations and the influence on the large-scale topographic mapping are analyzed. The conclusions are helpful to the practical application of the line-of-sight formula.