一种面向地貌因子的光照模型

从理论和实验两个方面分析了数字地貌晕渲中Lambert漫反射光照模型和基于坡向光照模型的优缺点,讨论了其中的原因,据此提出一种面向坡度、坡向及高程的光照模型,利用一个坡度随高程逐渐变化的二十四棱锥体和两种不同特征的地形数据对该模型进行了实验,结果表明该模型能够有效克服Lambert漫反射光照模型和基于坡向光照模型的缺点。

A relief factor oriented illumination model

This paper analysised the strongpoints and shortcomings of Lambert light model and aspect-based shading in digital relief shading using experiment.The reason of experiment outcome was discussed.A new light model oriented slope,aspect and elevation was introduced.It made an experiment on this new light model using a pyramind model which slope increased with elevation and two kinds of DEM data which are differently in terrein characteristic with each other.It was concluded that this new light model could overcome effectively the drawbacks of Lambert model and aspect-based shading.