Development and Data Analysis of Dual-Band All-Sky Cloud Cover Observation System

Yiren Wang; Ming Yang; Daxin Liu; Yingwei Xia; Wanyi Xie; Hongkun Wang; Yong Liu; Dong Liu

doi:10.3788/AOS220979

Acta Optica Sinica, Volume. 43, Issue 6, 0612001(2023)

Development and Data Analysis of Dual-Band All-Sky Cloud Cover Observation System

Yiren Wang^1,2, Ming Yang³, Daxin Liu^4、*, Yingwei Xia¹, Wanyi Xie^1,2, Hongkun Wang⁵, Yong Liu¹, and Dong Liu^1、**

¹Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China

²University of Science and Technology of China, Hefei 230026, Anhui, China

³Anhui Branch of East China Air Traffic Administration of Civil Aviation of China, Hefei 230001, Anhui, China

⁴Meteorological Observation Centre, China Meteorological Administration, Beijing 100081, China

⁵Anhui University, Hefei 230039, Anhui, China

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Figures & Tables(14)

Fig. 1. Structure diagram of dual-band automatic cloud cover observation system. (a) Schematic diagram; (b) physical picture

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Fig. 2. All-sky cloud images. (a) Visible light band; (b) infrared band

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Fig. 3. Sky images with different exposure values. (a) Cloudy sky; (b) clear sky

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Fig. 4. Atmospheric window characteristics

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Fig. 5. SegCloud segmentation results of visible light cloud images

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Fig. 6. Clear sky background radiation simulation. (a) Parameter fitting; (b) background simulation result

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Fig. 7. Segmentation results of infrared cloud images

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Fig. 8. Correlation analysis of visible light and infrared cloud cover. (a) Data of August; (b) data of September; (c) data of October

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Fig. 9. Correlation analysis of observation results of different cloud types. (a) High cloud data; (b) middle cloud data; (c) low cloud data

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Fig. 10. Statistical distributions of satellite cloud cover data and equipment data. (a) Data of August; (b) data of September; (c) data of October

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Table 1. Correlation analysis of visible light and infrared cloud cover
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Table 1. Correlation analysis of visible light and infrared cloud cover
Time August September October
Sample number 1032 1790 1884
R 0.885 0.869 0.897

Table 2. Correlation analysis of observation results of different cloud types
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Table 2. Correlation analysis of observation results of different cloud types
Cloud type High cloud Middle cloud Low cloud
Sample number 718 940 1412
R 0.67 0.73 0.84

Table 3. Comparison results of manual and equipment observation data
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Table 3. Comparison results of manual and equipment observation data
Time August September October
Sample number 171 297 317
Data percent for V_diff1>2 18.13% 17.51% 9.46%
Data percent for V_diff2>2 14.04% 19.53% 11.99%

Table 4. Comparison of satellite data and equipment observation data
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Table 4. Comparison of satellite data and equipment observation data
Time August September October
Sample number 171 297 315
Data percent for V_diff3>2 28.1% 17.5% 10.5%
Data percent for V_diff4>2 20.5% 22.3% 13.0%

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Yiren Wang, Ming Yang, Daxin Liu, Yingwei Xia, Wanyi Xie, Hongkun Wang, Yong Liu, Dong Liu. Development and Data Analysis of Dual-Band All-Sky Cloud Cover Observation System[J]. Acta Optica Sinica, 2023, 43(6): 0612001

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