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1956 1956年黄海高程系统以青岛验潮站根据1950年至1956年的验潮资料计算确定的平均海面作为基准面，据以计算地面点高程的系统
expl. Huanghai Vertical Datum
1956 年黄海高程系统
earth.sc. Huang Hai vertical datum 1956

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