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遥感技术与应用  2016, Vol. 31 Issue (4): 724-730    DOI: 10.11873/j.issn.1004-0323.2016.4.0724
数据与图像处理     
基于图像融合的反照率产品降尺度方法研究
蔡二丽1,2,窦宝成1,2,3,彭实2,刘强1,2,3,闻建光2,3
(1.北京师范大学,全球变化与地球系统科学研究院,北京 100875;
2.全球变化研究协同创新中心,北京 100875;
3.遥感科学国家重点实验室/中国科学院遥感与数字地球研究所,北京师范大学,北京 100101)
A Study of Albedo Product Downscaling Method based on Image Fusion
Cai Erli1,2,Dou Baocheng1,2,3,Peng Shi3,Liu Qiang1,2,3,Wen Jianguang2,3
(1.College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China;
2.Joint Center for Global Change Studies,Beijing 100875,China;
3.State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing
and Digital Earth of Chinese Academy of Sciences and Beijing Normal University,Beijing 100101,China)
 全文: PDF(7846 KB)  
摘要:

提出了一种基于物理意义图像融合的反照率降尺度算法,用以增强现有全球陆表特征参量(GLASS)反照率产品的空间分辨率,快速生成高分辨率反照率。首先对GLASS反照率产品和HJ反射率数据进行预处理,包括图像重投影、图像裁剪、雪像元和无效值像元掩膜;然后基于朗伯假设,将HJ反射率数据通过窄波段到宽波段的转换得到初级的高分辨率反照率;在此基础上将低分辨率的GLASS反照率产品与高分辨率的HJ数据进行融合得到高分辨率的反照率产品,其中考虑了GLASS产品的空间响应;最后分析了融合得到的高分辨率反照率影像,并使用黑河中游地面实测数据对融合结果进行了验证。结果显示:利用基于物理意义图像融合的反照率降尺度算法得到的高分辨率反照率产品精度较高(RMSE为0.02左右),并且该方法快速高效,具有推广和发展成为业务化算法的潜力。

关键词: 地表反照率GLASSHJ数据融合高空间分辨率    
Abstract:

An albedo downscaling algorithm based on image fusion with consideration of physical meaning was proposed to enhance the spatial resolution of the Global LAnd Surface Satellite (GLASS) albedo product and produce high\|resolution albedo rapidly.Firstly,data processings including image reprojection,image cropping,snow pixels masking were conducted for 1km GLASS albedo and 30m multiband reflectance acquired by the CCD sensor onboard the Chinese satellites HJ1A/1B (short for HJ/CCD).Secondly,the preliminary high\|resolution albedo was estimated by HJ/CCD reflectance through the method of narrowband to broadband conversion.Thirdly,considering the spatial response of GLASS albedo,the coarse\|resolution GLASS albedo and the preliminary high\|resolution albedo were fused to yield the final high\|resolution albedo.In the end,the fusion albedo with high spatial resolution was shown,analyzed and validated with In Situ data of middle Heihe River Basin.The results show that the high\|resolution albedo obtained by downscaling algorithm based on image fusion of physical meaning is with high precision (RMSE was 0.02 or so),and the algorithm is fast and efficient,indicating its potential to become an operational algorithm for high\|resolution albedo product.

Key words: Land surface albedo    GLASS    HJ    Data fusion    Fine spatial resolution
收稿日期: 2015-07-28 出版日期: 2016-10-14
:  TP 701  
基金资助:

国家自然科学基金重点项目(41331171),北京师范大学青年教师基金项目(2014NT20)。

作者简介: 蔡二丽(1991-),女,河南开封人,硕士研究生,主要从事地表反照率观测和反演研究。Email:celbnu@163.com。
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引用本文:

蔡二丽,窦宝成,彭实,刘强,闻建光. 基于图像融合的反照率产品降尺度方法研究[J]. 遥感技术与应用, 2016, 31(4): 724-730.

Cai Erli,Dou Baocheng,Peng Shi,Liu Qiang,Wen Jianguang. A Study of Albedo Product Downscaling Method based on Image Fusion. Remote Sensing Technology and Application, 2016, 31(4): 724-730.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2016.4.0724        http://www.rsta.ac.cn/CN/Y2016/V31/I4/724

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