激光扫描点云数据可以利用特定直观程序进行投影,帮助理解理数据中的建筑物结构.这类程序已经被广泛应用到自动建筑物模型建模中.该方法从高度直方图面元的分析中导出建筑物方位,并利用该方位产生点云的正交二维投影,其中屋顶平面作为点云的线.通过线跟踪算法提取表示这些平面的线段.在随后的处理步骤中,对线段进行延伸刨平,并且平面被用于分析与矩形形状的偏差.将两个或更多相邻平面分组以生成三维建筑模型.现有二维GIS数据可以用于该过程中以提供机载激光扫描数据集的可靠分割并且支持生成实际建筑物建模的假设.%Laser scanning point cloud data can be projected using a specific intuitive program to help understand the structure of the data in the building. Such procedures have been widely used in automated building modeling. The method derives a building orientation from the analysis of a high-degree histogram bin and uses the azimuth to generate an orthogonally two-dimensional projection of the point cloud, where the roof plane is the line of the point cloud. The line segments representing these planes are extracted by a line tracking algorithm. In the subsequent processing steps, the line segments are stretched and the plane is used to analyze deviations from the rectangular shape. Two or more adjacent planes are grouped to generate a three-dimensional building model. Existing 2D GIS data can be used in this process to provide reliable partitioning of the onboard laser scan dataset and generate hypotheses that support realistic building modeling.
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