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A paper about cloud detection [1], shows a fairly complex classification decision tree (figure 8 in the article), based on derived feature space resulting in 91% of correctly classified spectra.
![The decision tree from [1][1]](/klokantech/custom-scripts/blob/master/sentinel-2/hollstein/fig/tree.png)
The colours correspond to the colours from the article, apart from the colours for clear and shadow, which are made into natural (true) colour from red, green and blue bands.
[1] A. Hollstein et al., Ready-to-Use Methods for the Detection of Clouds, Cirrus, Snow, Shadow, Water and Clear Sky Pixels in Sentinel-2 MSI Images. Remote Sensing (2016). 10.3390/rs8080666