The establishment of datum is one of the important contents in the research on vertical crustal movement.
确定基准是研究地壳垂直运动的重要内容之一。
On account of site limitation, we used precise engineering surveying method for determining it. In this paper, we present datum establishment and surveying method.
针对跟踪站场地的现场情况，从测量基准的建立和测量方法两方面介绍采用非常规的方法精确测定天线的偏移量。
This paper introduced the consideration about design, establishment and the actualization process of the GPS three-dimensional datum network in Zhenhai city.
介绍了镇海区GPS三维基准网的设计思路、建立方法及实现过程，探讨了GPS水准代替四等水准在本项目中的实现情况。
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