ART模型不同角度下反演雪粒径参数分析  

Analysis of Snow Particle Size Parameters Retrieved from ART Model at Different Angles

作　　者：秦梦 QIN Meng(School of Earth Science and Resources,Chang'An University,Xi'an 710054,China)

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054

出　　处：《河南科技》2023年第7期107-111,共5页Henan Science and Technology

摘　　要：【目的】渐近辐射传输模型是可见光短波红外谱段一种典型的积雪二向反射率计算模型,该模型通过反演有效雪粒径以及表征雪污染特性的中间参量来模拟二向反射。但目前不同角度下雪的二向反射观测值存在差异,进而可能影响雪参数反演结果与在此基础上的二向反射计算值。基于此,本研究将开展不同角度下的雪粒径反演结果对比分析。【方法】基于POLDER多角度数据集开展ART模型分析。【结果】不同角度下有效雪粒径的反演结果具有较大差异,其差异性在27%~56%之间。【结论】有效雪粒径反演偏离较大的值主要集中在相对方位角主平面60°范围和观测天顶角大于50°的观测范围内,在应用单角度卫星数据时,建议剔除这部分角度下的反射率数据。[Purposes]The asymptotic radiation transfer model is a typical snow bidirectional reflectance calculation model in the visible short-wave infrared spectrum.The model simulates the bidirectional reflectance by inverting the effective snow grain size and the intermediate parameter,which represents the characteristics of snow pollution.However,there are differences in the observed values of bidirectional reflection of snow at different angles,which may affect the inversion results of snow parameters and the calculated values of bidirectional reflection on this basis.Therefore,this paper carries out comparative analysis of snow particle size inversion results from different angles.[Methods]The analysis was carried out based on the POLDER multi-angle data set.[Findings]The research shows that the retrieval results of effective snow particle size from different angles are quite different,with the difference between 27%and 56%.[Conclusions]The values with large deviation in effective snow particle size inversion are mainly concentrated in the range of 60°of the main plane of the relative azimuth angle and the observation range of the zenith angle greater than 50°.When applying the single-angle satellite data,it is recommended to eliminate the reflectivity data under these angles.

关 键 词：渐近辐射传输模型 二向反射率分布函数 雪粒径 POLDER 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]