Modern location practice is based on photo grammetric techniques. The parallel to traditional methods is striking; each contains the succeeding steps of area and route reconnaissance, preliminary survey, and final location.
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现代定线测量工作以摄影测量法为基础,和传统测量法的相同之处是显而易见的,都包括这些连续的工作步骤:区域和线路踏勘,初测以及最后的定线。
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