摘要
云的存在严重制约了遥感影像的处理和应用。通过分析云和典型地物的光谱特性差异,结合高分五号卫星全谱段光谱成像仪(VIMI)的波段设置,提出一种适用于高分五号卫星全谱段光谱成像仪的云检测算法。依照地物光谱特性的差异分别检测出厚云区域和薄云区域,两者合并得到初步云掩膜,通过比率判别和雪指数去除其中的高亮岩石和冰雪,得到最终的云掩膜。实验结果表明:该云检测算法可以取得较好的检测效果,准确率可达90%以上,并且运行效率较高。
By analyzing the difference of spectral characteristics between clouds and typical land covers,and combining with the spectral band setting of visual and infrared multispectral imager(VIMI)of GF-5satellite,a cloud detection algorithm for VIMI is proposed.Firstly,thick cloud pixels and thin cloud pixels are detected according to the difference of surface reflectance,and the initial cloud mask is obtained by combining the two kinds of cloud.Then,the bright rocks,ice and snow will be removed by ratio test and NDSI.Finally,the final cloud mask can be obtained.The result shows that the cloud detection algorithm can achieve great detection results and high operational efficiency with the accuracy over 90%.
作者
葛曙乐
董胜越
孙根云
杜永明
林滢
GE Shule;DONG Shengyue;SUN Genyun;DU Yongming;LIN Ying(China Centre for Resources Satellite Data and Application,Beijing 100094,China;School of Geosciences,China University of Petroleum,Qingdao 266580,China;State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences,Beijing 100101,China;China Great Wall Industry Corporation,Beijing 100054,China)
出处
《上海航天》
CSCD
2019年第S2期205-210,共6页
Aerospace Shanghai
基金
高分专项地面系统第二批研制项目
