Abstract:This paper studies the issues of linearization errors in regional gravity field modeling and introduces the high-order global gravity model as reference gravity field to reduce the corresponding linearization errors. As an example, we analyze the effects on regional gravity field modeling introduced by different reference gravity fields. To do so, we use Poisson wavelets radial basis functions based on terrestrial and shipboard gravity anomaly andon airborne gravity disturbance. The results show that the incorporation of global gravity field model, instead of GRS80-derived normal gravity field, as the reference gravity field leads a better approximation of the real gravity field. The corresponding linearization errors are also reduced. Compared to the quasi-geoid computed from the GRS80-derived normal gravity field, the accuracy of the quasi-geoid based on DGM1S-derived reference gravity field is improved by 1.5 mm, 3.3 mm and 9.0 mm at Germany, England and Norway respectively, where the topography show more undulation.
WU Yihao,LUO Zhicai. The Research on Linearization Errors in Regional Gravity Field Modeling Based on Heterogeneous Data Sets[J]. jgg, 2016, 36(6): 476-.