观测精度（observation accuracy）：观测精度就是指误差的密集或离散的程度。假如两组观测成果的分布相同，便是指观测成果的精度相同；反之，若误差分布不同，则精度也就不同。
观测精度历来是大坝观测中最需要关注的要素之一。
Observation accuracy is one of the most important factors in dam observation.
并较详细地分析了误差来源，提出一些提高观测精度的措施。
Based on a detailed analysis of error source, some measures for increase of observation accuracy have been suggested.
系统误差的实时修正是保证望远镜观测精度最基本的条件之一。
The real-time correction of system errors is one of basic terms for guaranteeing the observation precision of telescope.
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