基于激光点云的沉陷区水平位移求取方法研究

摘要

Three dimensional laser scanning technology could be used for subsidence monitoring of surface and buildings, which ap-peared in vertical direction.But horizontal displacement of subsidence zone was difficulty to be monitored with laser point cloud data as lack of information of the same point.Then a solution method of horizontal displacement was put forward according constructed virtual monitoring points of horizontal displacement.First, surface displacement was substituted by house displacement, the gravity center of house point cloud as virtual monitoring pointing, and then took characteristic points of house as reference object, artificial calibrated was applied on house point cloud data that collected from begin and after mining, then precise calibrated was applied based on ICP cal-ibration method.Spatial position difference of virtual monitoring points that before and after calibration was calculated, and then hori-zontal movement displacement was solved.The validity of the method was proved by application and studying of measured point cloud data .%三维激光扫描技术可用于监测沉陷地表或地物的垂直方向沉降,但由于缺少同名点信息,很难利用激光点云数据监测沉陷区的水平移动.通过构造水平移动的虚拟监测点,提出了一种水平移动的求取方法.首先,以房屋的移动量代替地表的移动量,将房屋点云的重心作为虚拟监测点;然后,以房屋特征点为参照对开采前后房屋点云数据进行人工粗配准,再使用ICP配准算法进行精确配准;最后,求取配准前后虚拟监测点的空间位置差值,从而求出水平移动量.通过实测点云数据对该方法进行应用研究,证明了该方法的有效性.