Abstract: Traditional measurement methods for obtaining the elevation of control points are high accuracybut time-consuming and labor-intensive. How to quickly acquire high-precision normal height has be-come one of the recent research topics in the field of surveying and mapping. This article proposes aGNSS elevation filtting method that considers two global gravity field models, namely EGM2008 and SGG-UGM-2. First, the gravity field model is used to generate gravity quasi-geoid; then a difference surface isgenerated based on the measured data and the gravity field model. Finally, the difference surface is fusedwith the gravity quasi-geoid to fit the gravity quasi-geoid to the actual quasi-geoid, thereby achieving thepurpose of correcting the gravity field models using the elevation anomaly points. In this paper, theEGM2008 and SGG-UGM-2 gravity field models are used, and the refined quasi-geoid model of YunnanProvince is adopted for accuracy verification. The test results, show that this method is stable and relia-ble, and can meet the requirements of common applications such as large-scale topographic mapping.

Key words: elevation anomaly, gravity feld models:Quas1-Geo1d:
EGM2008 Gravity Model:SGGUGM-2 Gravity Model