ICESat-2激光雷达噪声光子标识及分布特点研究

Study on Photon Labeling and Distribution Characteristics of ICESat-2 LiDAR Noise

利用PhotonLabeler实现对星载光子计数数据的噪声光子标识研究,并分析常见场景噪声光子分布特点,最后生成了一套光子计数噪声标识产品。本研究结果包括:太阳辐射会引起大量噪声出现;海洋区域的噪声光子会受到风浪、水深、海岸线、水中杂质等因素的影响;冰川情况下光子分布多受到积雪厚度、积雪密度、冰盖厚度、冰盖密集度及冰盖表面的粗糙程度等一些外来因素的影响;冬季情况下,噪声光子数目明显少于夏季,分析得出冠层高度及植被覆盖率等因素会引起大量噪声光子出现;多数情况下,弱光束对地表反演能力低于强光束,强光束可以捕获更多的光子点云数据。

In this paper,PhotonLabeler is used to realize the noise photon labeling research on the spaceborne photon counting data,and the research on the distribution characteristics of noise photons in common scenes is analyzed,and finally a set of photon counting noise labeling products is generated.The results of this study include:solar radiation will cause a lot of noise;noise photons in ocean areas will be affected by factors such as wind and waves,water depth,coastline,and impurities in water;photon distribution in glaciers is mostly affected by snow thickness,snow density,the thickness of the ice sheet,the density of the ice sheet,and the roughness of the surface of the ice sheet;in winter,the number of noise photons is significantly less than that in summer,and the analysis shows that factors such as canopy height and vegetation coverage will cause a large number of noise photons to appear;In most cases,the ability of weak beams to retrieve the ground surface is lower than that of strong beams,and strong beams can capture more photon point cloud data.