基于三维激光扫描数据的构筑物三角构网模型

三维激光扫描可以快速获得表面物体的三维空间的点云数据,但其数据量比较大,此外要利用这些点云数据表示构筑物表面,还需要建立表面数学模型。首先分析了激光扫描数据的采集原理和数据基本特点,具体给出了表面平面三角网生长算法,在此模型的基础上,利用三角形构成面后法线间夹角为判断依据,提出了空间三角构网的模型,并针对数据的复杂性和物体表面的不规则性,提出空间分区三角构网的方法,并以同济大学孔子头像为例给出了具体的实现方法。

Spatial triangular digital modeling of building based on laser scanning data

Spatial 3D Cloud points can be quickly captured on object surface by laser scanning.However, it will produce a large volume of data, and a surface mathematic model need to be established when these data to be used.In this paper, the basic principle of laser scanning technology and its definition of the coordinate system for 3D data cloud used in laser scanning are introduced firstly.Then, the growth algorithm of plane triangular for depicting object surface is generalized.Based on plane triangular model, a new spatial triangular digital model is put forward by considering the angle as the judge accordance between two normal line of the face established by the triangular plane.Case study and implementation method are given with Kongzi head portrait in Tongji University.