Threshold Optimization in Cloud Detection by Polarized Multichannel Remote Sensing

Wei Fang; Yanli Qiao; Dongying Zhang; Weining Yi

doi:10.3788/AOS201838.1228005

Acta Optica Sinica, Volume. 38, Issue 12, 1228005(2018)

Threshold Optimization in Cloud Detection by Polarized Multichannel Remote Sensing

Wei Fang^1,2、*, Yanli Qiao¹, Dongying Zhang^1、*, and Weining Yi¹

¹ Key Laboratory of Optical Calibration and Characterization of Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

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

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Figures & Tables(7)

Fig. 1. Flow chart of cloud detection

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Fig. 2. Histograms. (a) Separated two categories; (b) overlapped two categories

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Fig. 3. Relationship of confidence factors in fuzzy areas of datasets. (a) F1; (b) F2

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Fig. 4. Results of cloud detection. (a) POLDER method; (b) proposed method

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Fig. 5. H5 dataset of cloud detection. (a) POLDER method; (b) proposed method

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Table 1. Characteristics of POLDER load bands

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Table 1. Characteristics of POLDER load bands

Wavelength /nm	Bandwidth /nm	Polarized	Function
443	13.5	No	Sea
490	16.5	Yes	Sea/aerosol/cloud
565	15.5	No	Sea
670	15.0	Yes	Land/aerosol/cloud
763	11.0	No	Oxygen pressure of cloud
765	38.0	No	Oxygen pressure of cloud
865	33.5	Yes	Land/aerosol/cloud
910	21.0	No	Stem inversion
1020	17.0	No

Table 2. Pixel numbers of categories for POLDER method and proposed method
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Table 2. Pixel numbers of categories for POLDER method and proposed method
Method Clear Cloud Mixed
POLDER method 441 459 0
Proposed method 446 438 16

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Wei Fang, Yanli Qiao, Dongying Zhang, Weining Yi. Threshold Optimization in Cloud Detection by Polarized Multichannel Remote Sensing[J]. Acta Optica Sinica, 2018, 38(12): 1228005

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