Research on Refinement of Quasi-geoid Based on GNSS Leveling in Qianyingzi Mining Area
The high-precision quasi-geoid model of the mining area can replace the traditional level-ing method to measure the normal height,and realize the rapid acquisition of the three-dimensional coordi-nates of the ground objects by using GNSS technology.It is widely used in the update of the topographic map of the mining area,the establishment of the real three-dimensional model,and the construction of the digi-tal elevation model of the mine.The elevation anomalies of 19 reference points in the mining area are ob-tained by GNSS static measurement and second-class leveling.Polynomial plane fitting,four-parameter surface fitting and quadratic surface fitting are used to fit the quasi-geoid in Qianyingzi mining area.The cal-culation results show that the quadratic surface fitting effect is the best,the maximum residual error of each fitting point is 3.4 cm,and the maximum difference with the checkpoint is 4.6 cm,which can meet the needs of mining area topographic map updating.
GNSSquasi-geoidsurface fittingtopographic map updating of mining area
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