控制点数量与分布对GPS水准二次曲面拟合精度的影响

Influence of Number and Distribution of Control Points on the GPS Leveling Fitting Accuracy by Conicoid Fitting Method

GPS水准拟合中,二次曲面拟合法使用率较高,但控制点的数量与分布情况是制约二次曲面拟合精度的主要因素。作者采用"组合法"分析了控制点的选取过程和控制点的最优分布问题,最后通过实例对控制点的数量和分布进行优化分析,认为在丘陵地区200 km2内均匀分布10个左右GPS水准点,便可达到较高精度。

Conicoid fitting method is often used in GPS leveling fitting. The accuracy of conicoid fitting method depends upon the number and distribution of GPS control points. Combination method is applied to analyze the optimum number and distribution of GPS points in conicoid fitting method with a case. The result indicates that when about 10 standard GPS points are located within 200 km^2 in hilly area, higher accuracy can be achieved in GPS leveling fitting by conicoid fitting method.