【作者】 钱峻屏； 黄菲； 崔祖强； 郑志宏； 吴志军；

【Author】 QIAN Jun ping 1,HUANG Fei 2,CUI Zu qiang 3,ZHENG Zhi hong 3,WU Zhi jun 3 (1. Guangzhou Institute of Geography , Guangzhou 510070, China; 2. Ocean University of China, Qingdao 266003, China; 3. Guangzhou Meteorological Satellite Ground Statition , Guangzhou 510640, China)

【机构】 广州地理研究所广东省遥感与GIS应用重点实验室； 中国海洋大学海洋环境学院； 广州气象卫星地面站；

【摘要】 重点分析了不同等级能见度过程在MODIS 36 通道中的谱特征及与能见度的相关性,并对能见度进行了光谱统计分析。经去云处理后,对多点测站的相关分析发现:能见度因子和ch1,3,4,8,16,24,25,29~36的辐射和反射率存在很好的相关性(置信度达90 %以上,相关系数≥0.8),进一步的通道筛选和压缩对能见度的反演有重要意义。典型个例分析发现低能见度与高能见度天气过程存在较明显的光谱辐射和反射差异,可用于低能见度的识别。更多还原

【Abstract】 In this paper, the correlation between visibility and its spectral characteristics on 36 MODIS channels is analysed. The MODIS visibility data were first processed to remove the cloud effects, and the spectral and statistical analysis were then made for the visibility data. It is shown from the analysis results that the visibility factors show good correlations with the central wavelengths of reflection and radiation channels(confidence level is greater than 90% and correlation coefficients are not less than 0.8), and the further selection and reduction of MODIS channels are highly important to the retrieval of meteorological visibility. It is shown from the analysis results for several typical cases that the low visibility weather process differs from the high visibility weather process significantly in spectral radiation and reflection, which can be used to recognize the low visibility.更多还原