An Advanced Radiative Transfer and Neural Network Scheme and Evaluation for Estimating Water Vapor Content from MODIS Data

文献类型： 外文期刊

第一作者： Mao, Kebiao

作者： Mao, Kebiao;Zuo, Zhiyuan;Ma, Ying;Tang, Huajun;Mao, Kebiao;Liu, Guang;Mao, Kebiao;Liu, Guang;Mao, Kebiao;Shen, Xinyi;Ma, Ying

作者机构：

关键词： MODIS;water vapor content;neural network

期刊名称：ATMOSPHERE （ 影响因子：2.686； 五年影响因子：2.848 ）

ISSN： 2073-4433

年卷期： 2017 年 8 卷 8 期

页码：

收录情况： SCI

摘要： This work made an improvement upon and a further evaluation of previous work for estimating water vapor content from near-infrared around 1 mu m from MODIS data. The accuracy of RM-NN is determined by the complicated relationship of the geophysical parameters. An advanced scheme is proposed for building different training databases for different seasons in different regions to reduce the complexity. The training database includes three parts. The first part is a simulation database by MODTRAN for different weather conditions, which is made as a basic database; the second part is reliable field measurement data in observation stations; and the third part is the MYD05_L2 product on clear days, which is produced by the standard product algorithm for water vapor content. The comparative analyses based on simulation data indicate that maximum accuracy of single condition could be improved by about 34% relative to the "all conditions" results. Two study regions in China and America are selected as test areas, and the evaluation shows that the mean and the standard deviation of estimation error are about 0.08 g cm(-2) and 0.09 g cm(-2), respectively. All the analysis indicates that the advanced scheme can improve the retrieval accuracy of water vapor content, which can make full use of the advantages of previous methods.

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