海洋上空云多角度偏振辐射阈值检测方法研究

大气与环境光学学报 ›› 2021, Vol. 16 ›› Issue (3): 247-255.

• “高分五号卫星大气数据反演”专辑 • 上一篇下一篇

海洋上空云多角度偏振辐射阈值检测方法研究

王佳佳1,2, 孙晓兵1∗, 提汝芳1, 余海啸1,2

1 中国科学院合肥物质科学研究院安徽光学精密机械研究所, 中国科学院通用光学定标与表征技术重点实验室, 安徽合肥 230031; 2 中国科学技术大学, 安徽合肥 230026

收稿日期:2020-11-09 修回日期:2021-01-07 出版日期:2021-05-28 发布日期:2021-05-28
通讯作者: E-mail: xbsun@aiofm.ac.cn E-mail:xbsun@aiofm.ac.cn
作者简介:王佳佳 (1996 - ), 女, 安徽合肥人, 硕士研究生, 主要从事卫星偏振遥感、云偏振特性方面的研究。 E-mail: jjzml@mail.ustc.edu.cn
基金资助:
Supported by Key Technology Program for Satellite Application (卫星应用共性关键技术项目, 30-Y20A010-9007-17/18), National Key Research and Development Program of China (国家重点研发计划, 2016YFE0201400), High Resolution for Earth Observation (高分重大专项项目, GFZX04011805), Key Project of Hefei Institute of Physical Science Chinese Academy of Sciences (中国科学院合肥物质科学研究院重点项目, Y73H9P1801), Key Project in 173 Plan (173计划重点项目)

Multi-Angle Polarization Radiation Threshold Detection Method of Cloud Cover Over Ocean

WANG Jiajia1,2, SUN Xiaobing1∗, TI Rufang1, YU Haixiao1,2

1 Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; 2 University of Science and Technology of China, Hefei 230026, China

Received:2020-11-09 Revised:2021-01-07 Published:2021-05-28 Online:2021-05-28

摘要/Abstract

摘要： 云是海洋遥感的一项重要研究内容, 云检测精度对于海洋上空云微物理特性的反演和海洋水体观测具有重要意义。以高分五号卫星搭载的大气气溶胶多角度偏振探测仪 (Directional polarimetric camera, DPC) 在轨成像数据为研究对象, 提出了一种基于多角度偏振辐射信息的海洋上空云检测方法。首先用耀光角判别法区分出海洋耀光区域和非耀光区域, 然后利用多角度偏振信息对耀光区域进行云检测, 并基于反射率阈值、可见近红外反射率比值和偏振信息检验等方法对非耀光像元进行云检测。以印度洋和大西洋海域为例, 基于DPC数据进行了海洋上空云检测, 经过时空匹配后, 其结果与 MODIS (Moderate-resolution imaging spectroradiometer) 云掩膜数据一致性分别为 91.39% 和 94.73%。此外, 用法国 POLDER3 (Polarization and directionality of the earth′s reflectances) 数据验证了文中算法的有效性, 将云检测结果和 POLDER3 官方云检测产品对比, 一致性达到 90.40%。文中提出的多角度偏振辐射阈值云检测算法, 可为卫星观测的海洋上空云特性研究和海洋水体观测提供有效云检测数据。

关键词: 云检测, 多角度偏振探测仪, 海洋耀光, 多角度偏振辐射, 阈值

Abstract: Clouds are important in ocean remote sensing detection, and cloud detection accuracy is significant to the inversion of cloud microphysical characteristics over ocean and the observation of ocean water body. By using the on-orbit imaging data of the atmospheric aerosol multi-angle polarization detector (directional polarimetric camera, DPC) onboard GF-5, a detection method for cloud cover over the ocean based on multi-angle polarization radiation information is proposed. Firstly, the sunlight angle discrimination method is used to distinguish the ocean glint area and the non-glint area. Then the multi-angle polarization information is used to detect cloud in the ocean glint area, and on the other hand, the methods of reflectance threshold, the visible-near infrared reflectance ratio and the polarization information inspection are used to detect cloud in the non-glint aeras. Taking the Indian Ocean and the Atlantic Ocean as experiment aeras, cloud detection over the ocean was carried out based on DPC data, then the results were compared with MODIS (Moderate-Resolution Imaging Spectroradiometer) cloud mask data, and the consistency reaches 91.39% and 94.73% respectively. In addition, the data of French POLDER3 (polarization and directionality of the earth′s reflectances) is also used to verify the effectiveness of the proposed algorithm in this work, and the consistency between the cloud detection results and the official POLDER3 cloud detection productsreaches 90.40%. It is believed that the multi-angle polarization radiation threshold cloud detection algorithm proposed in this work can provide effective cloud detection data for satellite observation of cloud characteristics over the ocean and ocean water observation.

Key words: cloud cover, direction polarimetric camera, ocean glint, polarized radiation in multi-angle, threshold

中图分类号:

P407

王佳佳, 孙晓兵∗, 提汝芳, 余海啸, . 海洋上空云多角度偏振辐射阈值检测方法研究[J]. 大气与环境光学学报, 2021, 16(3): 247-255.

WANG Jiajia, SUN Xiaobing∗, TI Rufang, YU Haixiao, . Multi-Angle Polarization Radiation Threshold Detection Method of Cloud Cover Over Ocean[J]. Journal of Atmospheric and Environmental Optics, 2021, 16(3): 247-255.

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海洋上空云多角度偏振辐射阈值检测方法研究

Multi-Angle Polarization Radiation Threshold Detection Method of Cloud Cover Over Ocean

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