Abstract: Triangulated Irrgular Network (TIN)is regarded as an ideal digital terrain model in engineering design .It takes not only the density of topographical points but also the terrain points and terrain lines into consideration .Thereby its application precision can be improved .This paper gives a method to design the alignment of mountian highway which is based on the Triangulated Irrgular Network

Key words: TIN (Triangulated Irrgular Network), Highway , alignment design

摘要： 三角网数模(TIN)是一种目前公认的在工程设计中较为理想的数模，它可以在考虑地形碎部点密度的同时， 兼顾考虑地形的特征点、线，从而提高了数字地形模型的应用精度。笔者根据三角网数模的特点，提出了一种在 三角网数字地形模型基础上进行山区公路选线的方法

关键词: 三角网数模, 公路, 选线