斯潘8
span4
让我们诚实点云可能很难处理,它们会产生很多挫折。It helps to simplify the data that is contained within a LAS file especially if you're only interested in one part of the giant puzzle.查看点云中存在的信息的一种方法是创建形状文件。In the examples below,我们将演示如何在建筑物周围创建脚印或边界多边形,以及如何用单个点替换树。这些新的形状文件以更容易理解的视觉格式表示相同的区域。
下面的示例说明如何使用点云数据中的分类组件创建点和多边形。The results were compared to an orthophoto from the same year to see how accurate they were.由于在点云中不可避免地会出现一些错误的分类,the resulting shapefiles may also contain errors.如果你要用不同的,more complex point cloud than the ones used in the examples,further manipulation may be required.此外,由于拉斯维加斯数据集的性质,在对研究区域进行进一步分析时,应小心使用生成的形状文件。
如果在pointcloud胁迫之后检查数据,所有建筑点现在都已转换为单个多点功能。
The image below shows what the buildings now look like after being buffered and having mis-classified areas removed.我们现在需要填补建筑物的缺口。
下图显示了同一区域正射影像上方的一些最终建筑。虽然建筑物的多边形非常接近于实际建筑物,there are still some remaining errors that are difficult to pinpoint and remove.These errors will vary depending on the point cloud that is being used in a 亚搏在线workflow such as the above example.可能需要进一步的缓冲和测试迭代。
The image below shows some of the points that were generated using the above 亚搏在线workflow.就像建筑的例子一样,很多输出点都很好,然而,inaccuracies should be expected and further iterative or manual processing may be required.
© 2019 亚搏在线Safe Software Inc |合法的