滩涂机载LiDAR点云数据滤波方法研究

Fliter Algorithms of Airborne LiDAR Data in Coastal Tidal Flat

机载LiDAR点云数据滤波是制作高精度数字地形产品的重要环节。通过分析常用滤波算法基本原理、滩涂机载LiDAR点云数据的特点,提出了一种基于潮汐水位高程约束,移动窗口滤波与三角网渐进加密滤波组合的滤波方法。试验表明:该滤波方法获取的滩涂地形有效点云数据质量与人工滤波结果相当,在一定程度上提高了滩涂区域机载LiDAR点云数据滤波的效率,为快速获取滩涂区域数字高程模型提供了有效途径。

The filter of Airborne LiDAR in coastal tidal flat is an important processing to make high accuracy coastal tidal flat topographic map.The paper summarized the theory principle of filter algorithms and analyzed the LiDAR data's characteristics in tidal flat.An improved method is proposed,which considered the current tide water level,combined the filter methods of Elevation Threshold with Expand Window and Adaptive TIN Filter.The experimental results show that improved method has almost the same ability to filter LiDAR data in tidal flat with manual method using TerraScan software,but more effectively.