根据原始地形起伏变化的连续光滑性以及邻近数据点之间的相关性,研究了基于TIN的DEM表面光滑插值模型。首先,运用二元二次多项式曲面加权平均的办法,提出了一种基于TIN的具有C^1光滑性的DEM表面插值模型;然后,利用数学曲面对模型的精度进行了评估,并对实际地形进行了插值表示。结果表明,提出的表面插值模型具有较好的精度和光滑效果。
This paper studies how to build the smooth surface model of DEM based on TIN. Firstly, the surface patch on each triangle is constructed by the weighted combination of the three quadric patches at the vertices of the triangle. And a model of surface interpolation with continuities of DEM is given based on TIN. Then a mathematical surface is used to evaluate the accuracy of the model, and the model is applied to the representation of actual terrain. The result shows the model proposed with high accuracy and good smooth characteristic.