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海圖基準面

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海图基准面（Chart Datum，亦称海图基准、海图深度基准面、潮高基准面），是海图中定义深度为零的深度基准。海图中所有有关深度的数值，如等深线、干出高度，均为相对于海图基准面的深度差。如海图中某处海面标识数字19（m），即表示数字所标识处的海洋深度为海图基准面以下的19（米）。通常，海图基准面也是潮汐表的潮高起算面。

美國民用和海上使用的潮汐數據

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海圖基準面
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