【摘要】 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。更多还原

【Abstract】 Fast accurately coastline extraction using remote sensing method,is one of the important content for marine science research,topographic map surveying,hydrographic and coast & island investigation. LiDAR is becoming one of the most effective remote sensing approach,which could provide 3D surface data of coast and island with high accuracy and speed. First the LAS format of LiDAR data and the data processing flow are analyzed. Based on the average high tide level and the reflection intensity,the LiDAR points cloud data are filtered. Then,the Alpha Shapes algorithm is used in further filtering of the points data and the automatical extracting of the island coastline. The comparison with the high resolution image( 0. 5m) proves the Alpha Shapes algorithm is precision,effective and suitable for automatically coastline extracting based on LiDAR data.更多还原