EXTRACTION OF PLANAR PATCHES FROM POINT CLOUDS TO RETRIEVE DIP AND DIP DIRECTION OF ROCK DISCONTINUITIES
EXTRACTION OF PLANAR PATCHES FROM POINT CLOUDS TO RETRIEVE DIP AND DIP DIRECTION OF ROCK DISCONTINUITIES
复制标题
从点云中提取平面斑块以检索岩石不连续体的倾角和倾角方向
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
G. Forlani
中科院分区：
文献类型：
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作者：
R. Roncella;G. Forlani
激光扫描仪和图像匹配算法产生大量的3D数据，允许对物体进行详细和准确的描述。这是真的，但是，只有在交互式或自动化软件工具可用的情况下，才能从原始3D数据集中提取与特定任务相关的信息，而不需要太多的用户交互。在过去的两年中，我们的小组一直在应用新的测量方法来确定岩石表面不连续面的倾角和倾角方向；这些参数可以通过岩石的高分辨率DSM计算出来，从而可以进行稳定性分析。在本文中，我们描述了一种从岩石表面密集的DSM中自动提取岩石的不连续面并计算其参数的方法，该方法是通过摄影测量或激光扫描获得的。在原DSM基础上生成多分辨率DSM金字塔；在分层方案中，DSM在金字塔的每一层被分割成平面，使用带拓扑约束的RANSAC。还执行了两个聚类步骤，以平衡平面的碎片化和表面近似的准确性。最后，从法向量到每个平面计算倾角和倾角方向。该方法应用于一个试验点，得到的结果与传统的调查结果相当。
Laser scanners and image matching algorithms produce large amounts of 3D data, allowing detailed and accurate descriptions of objects. This is true, though, only if interactive or automated software tools are available, to extract the information relevant to the specific task from raw 3D data sets without too much user interaction. In the last two years our group has been involved in applying new surveying methods to determine the dip and dip directions of discontinuities in rock faces; knowledge of these parameters, that can be computed from an high resolution DSM of the rock, allows for a stability analysis to be carried out. In this paper we describe an automated approach to extract from a dense DSM of a rock face, obtained by photogrammetry or by laser scanning, the discontinuity planes of the rock and compute their parameters. A multi-resolution DSM pyramid is generated from the original DSM; in a hierarchical scheme, the DSM is segmented in planes at each level of the pyramid, using RANSAC with topological constraints. Two clustering steps are also executed, to balance the fragmentation of the planes and the accuracy of the surface approximation. Finally, dip and dip directions are computed from the normal vector to each plane. The proposed method, applied to a test site, gave results equivalent to those of a traditional survey.