小区域高程异常模型构建方法

Construction method of height anomaly model in subregion

构建高程异常模型的常用方法包括反距离权重法、克里金法、样条函数法和趋势面拟合法等。本文对比分析这些构建方法的原理和特点,以广东省西部的一个小区域测区为例,通过少量的控制点并采用不同的构建方法建立测区的高程异常模型,分析高程异常模型的精度。实验结果表明,当测区的似大地水准面精化成果的内符合精度优于5 cm时,拟合的高程异常模型精度优于10 cm,基本满足大比例尺地形图测量精度要求。

The common methods of constructing height anomaly model include inverse distance weight method,Kriging method,spline function method and trend surface fitting method.In this paper,the principles and characteristics of these construction methods were compared and analyzed.Taking a west subregion of Guangdong Province as an example,the height anomaly model of the survey area was established through a few control points and different construction methods.The experimental results showed that when the internal coincidence accuracy of quasi geoid refinement results was better than 5 cm,the accuracy of the fitted height anomaly model was better than 10cm and met the accuracy requirements of 1∶500 topographic map survey.