大地水准测量的实质是测量地面两点间的高差,然后通过已知点的高程,求出未知点的高程.直接利用高差计算某点的高程。
大地水准测量必须使用刻度标于不胀钢片上的水准标尺。
Geodetic leveling should be done with staves in which the divisions are marked on a strip of invar.
一般说来，水准测量测出的大地水准面高程的精度，远远超过任何其它方法的精度。
In general the accuracy of geoidal heights, as given by spirit levelling, much exceeds that of any other system.
GPS技术结合高精度、高分辨率的大地水准面模型可以取代传统的低等级水准测量，真正实现GPS定位技术在几何和物理意义上的三维定位功能。
GPS technique, combined with the high precision geodetic level model, can replace the traditional low-grade leveling, and realizes 3d GPS positioning function on the meaning of geometry and physics.
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