机载激光雷达数据具有直接描述对象几何特征、便于表达空间不连续变化等优势,是建筑物重建的主要数据源之一。为实现基于激光雷达点云数据的模型自动重建和解决现有方法存在的问题,提出了一种基于特征线提取、面向简单规则建筑物的重建方法。该方法以投影为基础,以平高分解为手段,通过在多个投影平面内逐步确定平面、高程信息实现特征线提取及模型重建。实验表明,该方法能够避免现有方法遇到的若干困难,有效重建简单规则建筑物模型。

Regular building model,characterized by rectangular outline and flat/slope/gable roof,is a general construction style,widely existing as either independent building or components of complex one.This study proposed an algorithm for building model reconstruction from airborne laser scanning data,based on feature line detection and separation of planimetric and height computations.The workflow is composed of five steps.First,ridge direction is detected in a series of horizontal plans between eaves and ridge of different heights.Second,points on the ridgeline are identified in a set of vertical sections,perpendicular to the ridgeline and within building extent.Third,planimetric parameters of feature lines are detected according to points located on them.Forth,height information is determined in vertical sections that go through each line.At last,8/10 coordinates are determined and a building model is established.