三维激光扫描数据获取高分辨率DTM试验研究

Experiment on high resolution DTM acquisition by 3D terrestrial laser scanner

三维激光扫描技术能够提供实体表面点云数据,可用于获取高精度高分辨率数字地形模型。本文以重庆万州区付家岩滑坡体为例探讨了采用三维激光扫描监测技术获取数字地形模型的方法,着重讨论了相关点云数据处理流程和关键技术问题。通过结合差分GPS技术进行激光数据的相对定位和绝对定位、去噪、拼接等方法,获得了该区域地表高精度地形数据,并生成了相应的数字高程模型。试验结果初步说明该技术可用于获取小尺度高精度高分辨率数字地形模型,具有一定的应用前景。

Terrestrial Laser Scanner technology provides a fast way acquiring 3-D point cloud data of earth surface objects,and could potentially be used to generate high resolution and accuracy digital terrain model(DTM).This paper investigates the method on high resolution and accuracy DTM generation from terrestrial laser scanner technology,with Fujiayan Landslide in Wanzhou district in Chongqing as a case study area.The paper is focused on point cloud data processing and key technology exploration.The laser scanned point data is relatively and absolutely positioned by combining traditional positioning technique with geodetic coordinates from differential GPS technology,followed with noise removal and mosaic.Point clouds with 3-D geodetic coordinates from different scenes can then be used to generate DTM using triangulation and vector-grid conversion techniques.The preliminary results show that this technology could be applied to acquiring high resolution and accuracy DTM at small scale.