Records of tide height have been kept for centuries at several seaports (Amsterdam since 1700, Liverpool since 1768, Stockholm since 1774, and many other places since 1850).
海洋的潮汐高度，好几个海港都保留着几个世纪的记录（阿姆斯特丹从1700年起就有记录，利物浦从1768年开始，斯德哥尔摩只从1774年开始，还有很多地方则是从1850年开始）。
潮水涨到顶点了。
Low tide: The minimum height reached in a falling tide.
退潮：潮水退至最低时的高度。
潮水涨到最高点了。
First, the defmation and status of height datums is introduced and some problems on the local height datums established by the mean sea level, which is defined by the tide gauge data, are discussed.
首先介绍了高程基准的定义与现状，指出了用验潮站长期平均海平面建立局部高程基准所存在的问题；
First, the defmation and status of height datums is introduced and some problems on the local height datums established by the mean sea level, which is defined by the tide gauge data, are discussed.
首先介绍了高程基准的定义与现状，指出了用验潮站长期平均海平面建立局部高程基准所存在的问题；
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