以下为句子列表：
英文: This paper introduces the signif9cance of geoid refining and three methods for refining geoid, and by using the abnormal height of GPS/leveling point, sets up several mathematic models of local geoid and makes the experiments and precision analysis.
中文: 介绍了大地水准面精化的意义和精化大地水准面的3种方法,用GPS/水准重合点的高程异常,建立了区域大地水准面的几种数学模型并做了实验和精度分析。
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