GAMIT在似大地水准面精化中的应用

Application of GAMIT software in quasi-geoid refinement

为了对在似大地水准面精化中的应用,利用TGO软件解算基线和网平差与GAMIT软件结合TFORM工具两种不同的方法分别处理GPS观测数据,获取大地高,同时利用三等水准数据获取正常高,再利用大地高和正常高的关系,在不考虑重力场模型和重力数据等影响的前提下,用二次曲面方法来拟合高程异常,在某市作了验证,两者的内符合精度相当,均能满足四等水准的精度要求。

GPS observation data are processed to obtain geodetic height using two methods including 1） a TGO software for calculating baseline and net adjustment, and 2） a GAMIT software combining with TFORM tool. At the same time, normal height is obtained using observation data at third-class level. Furthermore, using the relationship between geodetic height and normal height, an abnormal height was fitted based on quadric surface method without considering the effect of gravity field model and gravity data. The method is tested and the results show that the inner average precisions are similar, which meets the accuracy standards at fourth-class level.