逐点内插法建立DEM的研究

Study on building DEM based on point-by-point interpolation algorithm

本文讨论了移动拟合法和加权平均法两种逐点内插法建立DEM的原理及算法实现,并对其中的关键技术——动态确定阈值R和权函数的确定与实现进行了详细讨论。文章在分析常规权函数的基础上提出了一种新的定权方法。最后通过大量试验数据对两种内插方法的精度以及不同权函数的精度分别进行了评定。

The principle and realization of building DEM based on the algorithm of mobile camber fitting and distance-weighted is discussed in the paper. The key technology to determine the dynamic influential radius and the weight function is also discussed. A new weight function is proposed on the basis of analysis of the common weight function. In the end, the precision of the two interpolation algorithm and the different weight function is estimated individually through the large amount of test data.