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Study on the Retrieval Method of Cloud Coverage Based on TSI Imagers


Journal

Acta Energiae Solaris Sinica

Authors

Gao Xiaoqing, Jiang Junxia, Wang Ningbo, Lyu Qingquan, Li Zhenchao, Yang Liwei

Year

2018

Volume

39

Issue

1

Pages

95-100

Corresponding Author

Gao, XQ

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xqgao@lzb.ac.cn

Keywords

total sky imager (TSI); solar energy; solar radiation; image processing; image restoration

Abstract

Based on the observational data of Total Sky Imager (TSI-880) in Jinchang area of Gansu province, China, the ground-based images were restored. According to the statistical analysis of the sample data,a reasonable red-blue ratio threshold (0.84) for identifying cloud was obtained and an automatic system for batch ground-based images restoration and cloud coverage calculation was constructed. Combined with the solar radiation data from the radiation observatory in Jinchang,a cluster of the corrected cloud coverage (CCC) was calculated by the system. And a cluster of the original cloud coverage (OCC) was also calculated by the built-in system of the TSI. These two clusters were compared respectively with the solar radiation attenuation. The correlation coefficient between OCC and atmospheric radiation attenuation is 0.3.) The correlation coefficient between CCC and atmospheric radiation attenuation is 0.88, which indicates that the cloud coverage obtained by the system CCC has a better correlation with atmospheric radiation attenuation than OCC. This is of practical importance for the solar radiation nowcasting.