Comparative analysis of three velocity field models in CORS base station time series
The research on velocity field modeling method is of great significance to the time series analy-sis of global satellite navigation coordinates.Hence,the velocity field is modeled in this paper by using the improved Ordinary Kriging single model and the K-means-Ordinary Kriging combination model that take into account the influence of elevation factors to solve the problem that the Ordinary Kriging method cannot meet the accuracy requirements in modeling distribution sparse points and regional boundary points.The results show that both of the two improved models can improve the modeling accuracy of the basic Ordinary Kriging model,among which the modeling of the improved single model can get the most prominent improvement at SHK5 point,up to 8.66 mm/a,while the maximum improvement of 8.22 mm/a from the combined model modeling at NLIB point.The combined model can get a better modeling effect on the velocity field of the relatively low point density and boundary points from the perspective of STD value of all CORS points in the surveyed area.
NETL
NSTL
万方数据
维普
