中国人用重力仪来校正海平面的局部偏差。
The Chinese used a gravity meter to correct for local deviations in sea level.
一个经公认的已知值，如基点或海平面的高程，其它点的测量值根据该点的值进行校正。
An agreed and known value, such as the elevation of a benchmark or sea level, to which other measurements are corrected.
一个经公认的已知值，如基点或海平面的高程，其它点的测量值根据该点的值进行校正。
An agreed and known value, such as the elevation of a benchmark or sea level, to which other measurements are corrected.
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