Unification of national surveying vertical datum

来源期刊：中国有色金属学报(英文版)2005年第z1期

论文作者：YIN Xiao-dong HU Jia-sheng ZHANG Li-hua LI Shu-jun

文章页码：1 - 4

Key words：vertical datum； leveling datum； chart datum； geoid； quasi-geoid

Abstract: The vertical datum of China is composed of leveling datum for heights and chart datum for depths. The determination of national leveling datum and its disadvantages were discussed firstly. The local mean sea level and chart datum with its guarantee rate of navigation safety were studied secondly. The models of unification of national surveying vertical datum, such as optimization model of mean sea level, adoption of New Chinese quasi-geoid of 2000(CQG2000) and time-invariant global geoid were suggested finally.