Taiwan Vertical Datum

The height of the level reference point of Taiwan uses orthometric system. At the same time, the basis of height is defined under the standard atmospheric environmental conditions on January 1, 1990. It is calculated from the tide data of Keelung tide station from 1957 to 1991. It is named as 2001 Taiwan height basis (TaiWan Vertical Datum 2001, abbreviated as TWVD 2001).

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