基于Coons曲面的DEM模型的整体误差分析

Analysis of general error of DEM model based on Coons surface

研究了Coons曲面DEM模型的整体误差,得出如下结论:当原始数据的误差较小时,Coons曲面DEM模型的整体误差明显小于常用的双线性DEM模型的整体误差;随着原始数据误差的增大,二者的差距逐渐减小,直到趋于零.本研究对DEM精度理论的发展有积极的作用,为DEM的应用提供了更好的选择.

The general error of digital elevation model （DEM） based on Coons surface was studied. The conclusions were drawn as follows： when the primary data error is small, the general error of the Coons DEM model is obvious smaller than that of the linear polynomial DEM model, and their gap reduces gradually with the primary data error increased until it tends to zero. The research is helpful for promoting the development of DEM accuracy, and provides a preferable choice of DEM application.