The establishmentofdatum 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。
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On account of site limitation, we used precise engineering surveying method for determining it. In this paper, we present datumestablishment and surveying method.
This paper introduced the consideration about design, establishment and the actualization process of the GPS three-dimensional datum network in Zhenhai city.