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利用遥感手段快速准确地提取海岸线,是目前海洋科学研究、地形图测绘、海道测量、海岸带与海岛调查等工作的重要内容。本文以基岩海(岛)岸线为研究对象,在对机载LiDAR点云数据的存储格式、处理流程进行了分析后,基于平均大潮高潮面和激光反射强度,利用TerraSolid软件过滤LAS格式的LiDAR数据,初步获得海岛点云,随后引入Alpha Shapes模型算法自动提取海岛岸线并同步实现了噪音点的剔除。经与高分辨率卫星影像叠加对比分析,本文方法提取的海岛岸线平面精度较高,且具有良好的自适应性、速度快、稳定性高等特点,非常适合基岩海(岛)岸线提取与绘制。
The rapid and accurate extraction of coastline by means of remote sensing is an important part of marine scientific research, topographic mapping, hydrographic survey, coastal zone and island survey. In this paper, the shoreline of bedrock sea (island) is taken as the research object. After analyzing the storage format and processing flow of airborne LiDAR point cloud data, the LAS format is filtered by TerraSolid software based on the mean tide and laser reflection intensity LiDAR data, the island point cloud was obtained initially, and then the Alpha Shapes model algorithm was introduced to automatically extract the shoreline of the island and eliminate the noise point simultaneously. Compared with the superposition of high-resolution satellite imagery, the proposed method has the advantages of high coastline accuracy, good self-adaptability, high speed and high stability, which is very suitable for the shoreline extraction of bedrock sea With drawing.