摘要
为使GNSS高快速转化为正常高,需要进行高程异常拟合以获取二者之间的转化差值,通常通过构建数学模型拟合某个区域内的似大地水准面计算高程异常,但数学模型不能顾及拟合点与检核点之间的相对位置关系。为解决上述问题,采用相比数学模型具备更高拟合精度的距离加权模型,对2种距离加权模型在同一案例中的高程异常拟合对比。结果表明,二次曲面模型平均绝对误差为0.0371 m,移动曲面模型为0.0115 m,Shepard插值为0.0106 m,基于二次曲面的移动曲面模型相比二次曲面模型有较大的精度提高,Shepard插值法相对移动曲面模型拟合精度有一定提高。距离加权模型在高程异常拟合中精度高于数学模型,以Shepard插值法最优。
In order to quickly convert GNSS height to normal height,height anomaly fitting is required to obtain the conversion difference between them.Usually,the height anomaly is calculated by building a mathematical model to fit the Quasi-geoid in a certain area,but the mathematical model can not take into account the relative position relationship between the fitting point and the check point.In order to solve the above problems,the distance weighted model with higher fitting accuracy than the mathematical model is used to fit and compare the height anomaly fitting of the two distance weighted models in the same case.The results show that the average absolute error of quadric surface model is 0.0371 m,the moving surface model is 0.0115 m,and the Shepard interpolation is 0.0106 m.The precision of the moving surface model based on the quadric surface is higher than that of the quadric surface model,and the fitting precision of the Shepard interpolation method is higher than that of the moving surface model.The accuracy of distance weighted model is higher than that of mathematical model,and the Shepard interpolation method is the best.
作者
张兴汉
ZHANG Xinghan(Shenzhen Zhongming Hi-Tech Information Industry Co.,Ltd.,Foshan 528200,China)
出处
《测绘与空间地理信息》
2023年第2期222-224,共3页
Geomatics & Spatial Information Technology
