基于三种重力场模型在区域大地水准面中的应用

Application of Regional Geoid Based on Three Types Gravity Field Model

在传统大地水准面精化中,因高精度、高分辨率的DEM数据与重力异常数据获取困难,从而无法顾及地形及重力数据对大地水准面的影响,导致大地水准面的精度无法满足要求。针对上述问题,本文探讨了利用SRTM地形数据代替所需的高精度、高分辨率DEM地形数据,在我国数据空白区域,试验了不同分辨率的SRTM地形数据对区域大地水准面精化的影响,并在SRTM数据基础上顾及EGM96、EGM2008、Eigen-5C三种地球重力场模型,完成小区域大地水准面精化的实验,分析了大地水准面受SRTM数据影响的程度和规律。

During traditional geoid refining,considering the difficult of the many areas that have not enough high-precision and high-resolution DEM and gravity anomaly,so the precision of geoid can＇t meet the requrirement. Aimingat the above problems,this thesis using SRTM in instead of required high-precision and high-resolution DEM,havingtested relevance with different DEM resolution in data blank areas,then have completing the experiment of regional geoidwith EGM96、EGM2008、Eigen-5C,and have analysising the law of geoid based on SRTM. Some conclusions of this pa-per are very significant to study influence of GPS height transformation and geoid refining which areas without data.