These conventional control survey method work loads very big, work time long, condition influence and so on the climate, environment is been remarkable, moreover the error accumulates remarkably.
这些常规的控制测量手段工作量大，作业时间长，受气候、环境等条件影响显著，而且误差积累显著。
These conventional control survey method work loads very big, work time long, condition influence and so on the climate, environment is been remarkable, moreover the error accumulates remarkably.
这些常规的控制测量手段工作量大，作业时间长，受气候、环境等条件影响显著，而且误差积累显著。
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