基于点云数据的地裂缝监测对象提取研究以江苏无锡光明村为例

利用三维激光扫描技术得到的无锡光明村点云数据建立模型，通过运用Geomagic软件对监测对象地裂缝进行特征识别，评价地裂缝以及其对周围建筑物的影响。运用统计原理及数值计算，通过选取特征点以及特征直线的方法，以得到地裂缝的倾向、走向、长度、深度及两侧高差等特征数值信息，并且得出创建的特征点个数与结果准确率之间的关系。其次，采用平面拟合的方法，利用拟合平面的特征法向量，通过几何变换与计算，对由地裂缝引起的周围建筑物（此处重点研究墙体）的变形变化进行计算，定性并定量地分析地裂缝对墙体的影响。通过对地裂缝的特征以及周围墙体受影响程度的分析，提供该地裂缝的整治建议，为该地区后续地质情况分析以及灾害后的修复工作提供指导。在此基础上提供一种利用Geomagic获取检测对象特征信息的方法。

EXTRACTION OF GROUND FISSURE MONITORING OBJECT BASED ON POINT CLOUD DATA-A CASE STUDY OF GUANGMING VILLAGE,WUXI, JIANGSU PROVINCE

Using 3D laser scanning technology in Wuxi Guangming Village, obtained the point cloud data and build a model. We used geomagic distinguish the characteristics of groung fissure, then evaluated itself and its influence on the surrounding construction. Using statistical principle and numerical calculation, we adopted the method of selecting feature points and feature lines to obtain ground fissure's tendency, direction, length, depth and dispersion. In addiction, we studied the influence of the number of feature points on the accuracy of the result. Besides, using the eigenvector of the fitting plane, obtained the tilt degree of the wall caused by the ground fissure through geometric transformation and calculation. Finally we obtianed qualitative and quantitative analysis of the effects of ground fissure. Through the analysis of the characteristics of the ground cracks and the influence of the surrounding walls, we can offer renovation suggestiond on this fissure, guide analysis of subsequent geological conditions. We can also provide a method of using geomagic to get the feature information of the monitored objects.