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For the first time,the orthometric height of Mount Qomolangma based on the international height reference system (IHRS) is determined and released in the 2020 height measurement campaign of Mount Qomolangma.In order to realize the IHRS in the region of Mount Qomolangma,the scheme of establishing high precision gravimetric geoid model in this area is adopted.Based on the spectral combination approach and data-driven spectral determination method,the gravimetric quasigeoid model in the area of Mount Qomolangma is computed from the combination of airborne and terrestrial gravity data.Optimal reference gravity model,its truncation degree and spherical cap integration radius are chosen through comprehensive test.The validation against highly accurate GNSS leveling measured height anomalies at 61 benchmarks indicates that the accuracy of the gravimetric quasigeoid model reaches 3.8 cm and the addition of airborne gravity data improves the model accuracy by 51.3%.The interpolation method considering height difference correction is proposed for interpolating the height anomaly at the summit from the quasigeoid model.The rigorous formula for geoid-quasigeoid separation considering topographic masses is used for converting the height anomaly to the geoid undulation at the summit.Based on the IHRS defined gravity potential value W0 and the GRS80 reference ellipsoid,and using the newly observed ground gravity at the summit,the high precision geoid undulation of Mount Qomolangma in the IHRS is determined.
