Preprocessing steps for permanent water

[edornd]

Hi, first off, thank you for this resource!

I was testing both flood and permanent water segmentation, and I noticed that the Sentinel-1 images have two slightly different formats: I believe that Flood and Weakly have the same logarithmic scale, while the JRC perm_water subset has been normalized between 0 and 1

flood range: [-60.44136, 36.832024]
water range: [0.0, 1.0]
weak  range: [-70.71592, 39.25037]

Plotting them it looks like a very "low contrast" image: I'm obtaining close results by applying np.clip(10 ** (img_flood / 50), 0, 1) to the flood ones, however I can't find the exact transformation that you applied there.
Where can I find more info about that? Apologies if it's already documented somewhere, I couldn't find anything on this regard.
Thanks!