针对南水北调中线工程具有线路长、地势较平坦的特点, 提出利用EGM2008 地球重力场模型的方法。以水 准测量成果为真实值, 计算高程拟合内外符合精度及每公里高差中误差, 评定EGM2008 模型与平面拟合方法的高 程拟合精度。结合南水北调中线工程实例表明, EGM2008 模型获取正常高结果可以达到四等水准测量要求, 且拟 合精度优于平面拟合精度。因此, EGM2008 地球重力场模型在高程测量中的应用, 有助于实现南水北调中线工程 中平面和高程控制测量的一体化。

In terms of the char acter istics of long r oute and smo oth terr ain of the Middle Route of the South2to2Nor th Water Transfer Pro ject, this paper pr oposed a method to ca lculate the heig ht anomaly and obtain the no rmal heig ht using the EGM2008 model. The leveling results w ere co nsidered as the tr ue values, the elevation fitting precision and er ro r in the elevatio n differ ence per kilometer w ere calculated, and the height fit ting precisio n based on the EGM2008 mo del and plane fitt ing method was evaluated. Accor ding to the eng ineering ex ample, it show ed that the no rmal heig ht results obtaining fr om the EGM2008 model can meet the demand o f fourth2g rade2leveling and the f itting pr ecision is bet ter than that obtained f rom the plane fitting met ho d. Thus, EGM2008 model can realize the integ ration of ho rizo ntal and vert ical contr ol sur vey in the Middle Route of the So ut h2to2Nort h Water T ransfer Pr oject.

国家自然科学基金项目( 41101373)