基于SRBF法确定似大地水准面的数值分析OA

This paper employs the spherical radial basis function(SRBF)method to integrate terrestri-al gravity and airborne gravity data for the computation of the gravity quasi-geoid.Experiments are conducted from aspects such as terrain effects,model order,and basis function parameters to investi-gate the impact and variation patterns of different parameters.The results show that:1)The burial depth,effective distance,and expansion order of the basis function all affect the quality of the quasi-geoid refined by the SRBF method.The precision difference of the geoidal height anomalies corre-sponding to different parameter settings can reach up to 2.4 cm;2)Considering the terrain effects when calculating residual gravity data can improve the final quasi-geoid precision by 21.6％;3)Using two sets of GNSS/leveling points with different precisions and distributions for external validation of the quasi-geoid results,the best validation precision differs by 4.3 cm;4)In mountainous areas,by optimizing parameters to integrate terrestrial and airborne data,the optimal precision of the quasi-ge-oid result can reach 2.7 cm.