Determination of regional quasi-geoid using gravity field models and GPS/leveling data

In order to use the information of GPS observation and to translate ellipsoid height into normal height of observation point,A regional quasi-geoid model of 1.5′×1.5′distinguish rate is constructed with geometry method,using EGM96 and EIGEN-CG01 gravity field models and GPS/Leveling data.The height anomaly of quasi-geoid model is compared with GPS/Leveling height anomaly.The inner and outer accuracy of is less than 0.040m.This shows that the region quasi-geoid model of centimeter accuracy can be derived from geometry method in smooth region,using GPS/ leveling data of 10km average distance.The model and ellipsoid height of GPS can apply to substituent four-grade and lower grade leveling observation.