基于EGM2008区域似大地水准面精度分析

Precision analysis based on the EGM2008 area quasigeoid

青海省绝大多数单位采用EGM96模型进行高程拟合,EGM2008全球重力场模型并未被采用。文中利用软件为载体,分别导入EGM96和EGM2008地球重力场模型,计算得到所选点位模型正常高,然后利用正常高和大地高间的关系,得到高程异常,进而求得似大地水准面精度,通过比较,EGM2008地球重力场模型所得区域似大地水准面的精度明显高于EGM96,具有一定的参考价值。

Although EGM2008 gravity field model is a globally used one,EGM96 is still the main model for elevation fitting in Qinghai Province.This paper,by using the software as the carrier,introduces EGM2008 and EGM96 respectively into earth gravity field model,calculates normal height of the setpoint.The differences between normal height and the earth were used to calculate quasigeoid accuracy.EGM2008 earth gravity field model has higher precision than EGM96.The method is simple with high precision,which has the certain reference value.