使用FME与VBA提取机场方格网高程数据

Using FME and VBA to extract the elevation data of airport grid

因受机场工程设计软件的测量数据容量限制,基于LiDAR采集、点云分类后得到的地面点云数据LAS不能完整应用于目前设计软件进行设计计算。本文通过对拟选技术方案的筛选,提出了利用FME Workbench数据处理功能,结合VBA编程获取外部方格网平面数据的方法。该方法在FME Workbench中实现了地面点云数据构建TIN、采用逐点内插方法从TIN中提取方格网高程数据、等高线生成及相应图形处理与成果输出。最终通过实际算例证明了该方法的有效性。

The ground of the point cloud classification after get point cloud data currently in LAS cannot completely applied to design software for design calculation. Through the screening of the proposed technical scheme, the method of using the data processing function of FME Workbench combined with VBA programming to provide the plane data of external grid is proposed. In the FME Workbench, the ground point cloud data is used to construct TIN, the grid elevation data is extracted from TIN by point-by-point interpolation method, the contour line is generated, the corresponding graphic processing and the output of results are achieved, and the effectiveness of the method is demonstrated by the actual calculation examples.