船载LiDAR在陡岸水库测绘中的应用研究

Study on the Application of Shipborne LiDAR in the Mapping of Steep Bank Reservoir

摘要: 长江上游陡岸水库具有地貌复杂、地形破碎、植被覆盖茂密等特点。针对陆上地形测绘采用人工走测方式难度大、效率低、风险大；采用航空摄影测量空域申请手续程序多、周期长、禁飞区多、受风力影响航飞风险大等问题，提出利用船载LiDAR获取水库陆上地形空间三维信息的方法。本文根据实验区检验点分析了船载LiDAR点云的精度。定性结果表明：船载LiDAR具有作业效率高、非接触等优点，适用于陡岸水库地形测绘。定量结果表明：高程较差中误差为0.145 m和0.211 m，点云精度满足大比例尺地形图测量规范要求。

Abstract: The steep bank reservoir in the upper reaches of the Yangtze River is characterized by complex landform, broken terrain and dense vegetation. It is difficult, low efficiency and high risk to adopt manual surveying method for landform surveying and mapping. Based on the problems of aerial photogrammetry, such as long application procedures, long period, many no-fly zones and large flight risk affected by wind, a method of obtaining three-dimensional information of reservoir land-form space by shipborne LiDAR is proposed. In this paper, the accuracy of shipborne LiDAR point cloud is analyzed according to the test points in the experimental area. The qualitative results show that the shipborne LiDAR has the advantages of high efficiency and non-contact, which is suitable for the topography mapping of the steep bank reservoir. The quantitative results show that the er-rors in the difference of elevation are 0.145 m and 0.211 m, and the accuracy of point cloud meets the requirements of large scale topographic map measurement standards.