Evaluation of ultra-high degree gravity field models: a case study of Eastern Tibetan Plateau and Sichuan Province

Abstract This study validates the ultra-high-degree gravity field models in terms of internal error estimate and external precision. Internal is evaluated by geoid degree variance cumulative height errors. The evaluation precision carried out using observed ground data sets Qinghai-Tibet Plateau Sichuan Basin mainland China. results show that at millimeter level, accumulated centimeter SGG-UGM-2 has highest However, anomaly, GECO model 37.080 mGal Plateau, after terrain correction, its can reach 28.907 mGal, an improvement 22%. In Basin, EGM2008 performs best with a 7.202 mGal; becomes 6.648 correction. These mean correction must be considered area where topography varies largely, while when relatively flat, effect on ignored.