An Improved Cloud Masking Method for GOCI Data over Turbid Coastal Waters
Abstract
:1. Introduction
2. Materials and Methods
2.1. GOCI Data
2.2. An Improved Cloud Masking Method
- Step 1.
- calculate the Rayleigh-corrected reflectance at the four bands of 412 nm, 660 nm, 680 nm, and 865 nm;
- Step 2.
- calculate the according to Equation (1), which was proposed by Nordkvist et al.;
- Step 3.
- pixels satisfying either of the following two conditions (1 or 2) are masked as clouds:
- (1)
- and and ;
- (2)
- and and .
3. Results
3.1. Comparison of Four Cloud Masking Methods Using Selected Samples
3.2. Performance Comparison Over Typical Turbid Waters
3.3. Performance Comparison Over Other Areas
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Region | Date | Total Pixel Number | Clear Pixel Percentage | |||
---|---|---|---|---|---|---|
NIR Threshold | Wang and Shi | Nordkvist et al. | This Study | |||
Lake Tai Hangzhou Bay | 19 August 2017 | 17,952 | 4.23% | 28.67% | 65.61% | 79.77% |
35,321 | 9.65% | 40.25% | 82.59% | 94.63% | ||
Subei coastal | 10 February 2020 | 83,659 | 2.88% | 33.59% | 70.65% | 99.37% |
Hangzhou Bay Yangtze River | 6 January 2020 | 30,056 | 0.00% | 29.12% | 77.65% | 92.12% |
15,836 | 0.01% | 55.41% | 71.47% | 97.95% | ||
Averaged clear pixel percentage | 3.35% | 37.41% | 73.59% | 92.77% |
Region | Date | Total Pixel Number | Clear Pixel Percentage | |||
---|---|---|---|---|---|---|
NIR Threshold | Wang and Shi | Nordkvist et al. | This Study | |||
Bohai Bay | 1 April 2019 | 31,104 | 31.77% | 36.97% | 85.58% | 99.88% |
Korean Peninsula | 18 April 2019 | 57,449 | 41.85% | 56.99% | 81.85% | 97.43% |
Averaged clear pixel percentage | 36.81% | 46.98% | 83.72% | 98.66% |
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Lu, S.; He, M.; He, S.; He, S.; Pan, Y.; Yin, W.; Li, P. An Improved Cloud Masking Method for GOCI Data over Turbid Coastal Waters. Remote Sens. 2021, 13, 2722. https://doi.org/10.3390/rs13142722
Lu S, He M, He S, He S, Pan Y, Yin W, Li P. An Improved Cloud Masking Method for GOCI Data over Turbid Coastal Waters. Remote Sensing. 2021; 13(14):2722. https://doi.org/10.3390/rs13142722
Chicago/Turabian StyleLu, Shiming, Mingjun He, Shuangyan He, Shuo He, Yunhe Pan, Wenbin Yin, and Peiliang Li. 2021. "An Improved Cloud Masking Method for GOCI Data over Turbid Coastal Waters" Remote Sensing 13, no. 14: 2722. https://doi.org/10.3390/rs13142722