Station error in precipitation observation consists both random error and systematic error.

降水量观测误差包括随机误差和系统误差。

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An estimation method of station error in precipitation observation is given and its effect on the water resources appraisal is pointed out.

本文给出降水量观测误差的估算方法，并指出其对水资源评价结果的影响。

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It has clear physical mechanism because it combines the information of ground precipitation observation station and aerial rain cloud in the process of directional retrieval.

由于综合了地表雨量站点和空中云层信息，因此反演具有明确的物理机制。

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