摘要
机载激光雷达技术可以快速获取建筑物高精度高密度的三维空间信息。文章提出一种建筑物三维模型重建方法,该方法利用栅格数据使用RANSAC算法提取建筑边界上的长线段,采用规则化策略获取建筑轮廓;在模型生成阶段,基于原始点云和屋顶拓扑关系约束,获取屋顶间的交线和交点,并结合已得到的建筑边界、屋顶间交线和交点获取三维建筑模型。实验结果表明,该方法思路清晰、科学可行且适用性强,提取的建筑边界和模型垂直精度高。
Since airborne LiDAR system can obtain 3D information of buildings with a high accuracy and point density, airborne LiDAR data is widely used for 3D building model reconstruction. This paper proposed a method to obtain 3D building models thai： in order to obtain regular boundaries, the building points are fristly rasterized and then boundary points are extracted by the a-shape algorithm; secondly, the RANSAC method is performed to extract segments from boundary points; thirdly, regularized build- ing outlines are derived by regularization strategies including collinear mergence and orthogonal adjust- ment; meanwhile, building roof intersection segments and points are estimated based on their topology information and the original building points; finally, 3D building models are generated by combining reg- ularized boundaries, roof intersection segments and points. Experimental results demonstrated that the proposed method would have strong feasibility with high planimetric accuracy of building outlines and high vertical accuracy of the reconstructed model.
出处
《测绘科学》
CSCD
北大核心
2014年第11期37-41,共5页
Science of Surveying and Mapping
基金
国家自然科学基金面上项目(41171267)
中科院百人计划专项
