TIN地形曲面任意点法向量的高精度解算模型

The Model of High-Accuracy Calculation of Normal Vector of Random Points from TIN

曲面法向量是基于TIN完成数字地形解析分析的重要参考基础。本文首先分析了TIN中的三角形形状与地形曲面姿态的关系问题,然后构建了以地形曲面形态的"相近相似"特征为基点的V-Rub法向量解算模型。实验结果显示,V-Rub模型解算法向量的精度高,速度快,具有很好的实用价值。

Normal vector of a curved surface is an important reference frame for digital terrain analysis based on TIN.The paper first analyzes the relationship between the shape of the triangle in TIN and the gesture of the terrain surface,and then constructs the V-Rub normal vector calculation model with the base point of the character ＂closeness and similarity＂ of terrain surface.Experimental results show that the V-Rub calculation model has good practicality with accuracy and rapidity.