摘要
The model of Dam Area Quasi-geoid can be obtained by using the difference between GPS geodetic height and level normal height which has been fitted by Least-squares Camber,the precision is high.Altitude abnormal value of any point in the dam area can be obtained by the model,plus GPS geodetic height,equals normal height which has high precision,the plane position of the point can be obtained at the same time.The model of Quasi-geoid of Xinglong Dam Area has been build in this paper,the precision of height measurement can meet the requirement of third leveling,which provides a high precision surveying datum for engineering construction.