干旱区生态环境知识资源中心(Arid): Multi-information collaborative cloud identification algorithm in Gaofen-5 Directional Polarimetric Camera imagery

Arid

DOI	10.1016/j.jqsrt.2020.107439
	Multi-information collaborative cloud identification algorithm in Gaofen-5 Directional Polarimetric Camera imagery
	Li, Jinghan; Ma, Jinji; Li, Chao; Wang, Yuyao; Li, Zhengqiang; Hong, Jin
通讯作者	Ma, JJ (corresponding author), Anhui Normal Univ, Sch Geog & Tourism, Wuhu 241003, Peoples R China. ; Ma, JJ (corresponding author), Engn Technol Res Ctr Resources Environm & GIS, Wuhu 241003, Peoples R China.
来源期刊	JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
ISSN	0022-4073
EISSN	1879-1352
出版年	2021
卷号	261
英文摘要	The Directional Polarimetric Camera (DPC) onboard China's Gaofen-5 (GF-5) satellite has provided multi angle (3-polarization channel), large-scale (1850 km swath width and 3.3 km spatial resolution), and high-frequency (2-day revisit period) Earth observation since May 2018. These features make DPC imagery application scenarios extensively. However, like other optical imagery, the presence of clouds is also a pervasive and unavoidable issue in DPC imagery. To leverage both radiation and polarization properties of DPC, we proposed a multi-information collaborative (MIC) method to identify clouds in the DPC imagery. Instead of a fixed single threshold, the MIC method adopts dynamic thresholds obtained by simulation in different atmosphere models, at different times, and under different underlying surfaces. Specifically, we included surface albedo and ice/snow cover distribution libraries to the MIC method, as they compensate for fewer spectral bands in the DPC imagery, thereby improving the accuracy of cloud detection results, especially in special bright surface scenarios (e.g., desert, bare soil and ice/snow). We also added an ice/snow detection algorithm to further eliminate the issue of misidentifying ice/snow pixels as clouds. Finally, after obtaining the DPC cloud mask results based on the MIC method, we calculated four cloud confidence levels for different application requirements by cloud quality evaluation criteria. We evaluated the MIC algorithm by comparing it with two other independent satellite cloud observation products, namely Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) and Moderate Resolution Imaging Spectroradiometer (MODIS). We found that the MIC cloud mask is in good agreement with the other two cloud products, with agreement probabilities of 93.06% (CALIPSO) and 85% (MODIS), respectively. Furthermore, the detected high confidence cloud and clear sky results agree with the CALIPSO cloud confidence products by more than 97.35% and 96.13%, respectively. We therefore suggest that the MIC method can provide the basis for subsequent studies of atmospheric parameters, such as accurate retrieval of aerosol optical thickness (AOT), cloud optical thickness (COT), cloud droplet effective radius (CDR) and land surface reflectance. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Directional Polarimetric Camera (DPC) Multi-information collaborative (MIC) Cloud identification Cloud confidences Dynamic threshold Surface library
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000642454800010
WOS类目	Optics ; Spectroscopy
WOS研究方向	Optics ; Spectroscopy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350976
作者单位	[Li, Jinghan; Ma, Jinji; Li, Chao; Wang, Yuyao] Anhui Normal Univ, Sch Geog & Tourism, Wuhu 241003, Peoples R China; [Hong, Jin] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Opt Calibrat & Characterizat, Hefei 230031, Peoples R China; [Li, Zhengqiang] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Environm Protect Key Lab Satellite Remote S, Beijing 100101, Peoples R China; [Li, Jinghan; Ma, Jinji; Li, Chao; Wang, Yuyao] Engn Technol Res Ctr Resources Environm & GIS, Wuhu 241003, Peoples R China
推荐引用方式 GB/T 7714	Li, Jinghan,Ma, Jinji,Li, Chao,et al. Multi-information collaborative cloud identification algorithm in Gaofen-5 Directional Polarimetric Camera imagery[J],2021,261.
APA	Li, Jinghan,Ma, Jinji,Li, Chao,Wang, Yuyao,Li, Zhengqiang,&Hong, Jin.(2021).Multi-information collaborative cloud identification algorithm in Gaofen-5 Directional Polarimetric Camera imagery.JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER,261.
MLA	Li, Jinghan,et al."Multi-information collaborative cloud identification algorithm in Gaofen-5 Directional Polarimetric Camera imagery".JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 261(2021).