基于多点的规则格网DEM的传递误差分析

论述了利用数量不同的格网数据构建的样条函数DEM模型和Coons曲面DEM模型的传递误差不同,指出同一插值方法的DEM模型随着构建模型所用的格网数据数目的增多,传递误差增大;当格网数据数目同样多时,减弱相邻格网单元上格网数据权重比例,传递误差就会相应地减少。

The Propagation Error Analysis of Grid DEM Based on Many Points

Based on Splines interpolation and Coons DEM,the different model to the propagation error of grid DEM constructed from different grid points' quantities was obtained,the model showed that the propagation errors of the Splines DEM model and the Coons DEM model were different.And the more grid points the model of grid DEM was based on,the bigger the propagation error of the DEM model based on same interpolation was.When the number of grid points were the same,the propagation error of the DEM model would decrease by weakening the weight of some adjoining grid points.