TIN全称为不规则三角网数字模型(Triangulated Irregular Network,TIN)，它用一组连续而不重复的三角形逼近地形表面，是数字地面模型中的一种主要表示方法。



-TIN called the triangulated irregular network digital model (Triangulated Irregular Network, TIN) with a set of continuous without repeating the triangle approximation of the terrain surface, is a major representation in the digital terrain model.