Sentinel-Hub custom rendering settings

[blumenkraft]

Share your custom rendering settings here.

[blumenkraft]

return [B8A*2,B03*1,B02*2]

Sometimes it's hard to distinguish melt ponds from shadows from clouds. This setting makes the shadows purple, while melt ponds are bright blue (second pic).

[blumenkraft]

return [B8A*1,B03*1,B02*1]

This one is the 'real' natural colors setting (IMHO). See it as the default setting.

[blumenkraft]

return [B8A*2,B03*1,B02*1]

This setting is the most useful in the early melting season for me. It makes spotting melt ponds very easy. Non-wet ice would appear in pinkish tones but liquid water on ice is bright blue. Deeper melt ponds are getting darker towards the middle where they are deeper (second pic).

[kassy]

Maybe add a short description of the sort of detail they bring out?

[blumenkraft]

Absolutely, Kassy! Done.

[Freegrass]

Share your custom rendering settings here.

Thanks for this Blum! Really helpful.

[blumenkraft]

Welcome, FG. I hope others share theirs too!

[blumenkraft]

Fun! This one makes melt ponds and very wet ice green!

return [B8A*1,B03*1,B09*9]

[SimonF92]

Im working on a large project at the moment (Scottish snow, not Arctic stuff), but heres the mask im using;

easy distinction between clouds and ice/snow

https://apps.sentinel-hub.com/sentinel-playground/?source=S2&lat=81.2492016395353&lng=-70.00167832709849&zoom=11&preset=CUSTOM&layers=B01,B02,B03&maxcc=100&gain=1.0&gamma=1.0&time=2020-01-01%7C2020-07-01&atmFilter=&showDates=false&evalscript=cmV0dXJuIFtCMDEqMi41LEIwNCoyLjUsQjExKjIuNV0%3D


You can separate ice (yellow) from clouds (white) in python with;

img = cv2.imread(directory + filename)
hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
lower_range = np.array([22, 93, 0])
upper_range = np.array([45, 255, 255])
mask = cv2.inRange(hsv, lower_range, upper_range)

'mask' then becomes cloud-corrected ice, with caveats

[SimonF92]

Im still improving this, but I think it will come in pretty handy when I get it working, for tracking the area of small ice caps

Real
Ice
Clouds
Open-ground


Will post a link to the github when done

[SimonF92]

Some data iv generated with this "bluebird" technique on a well known Scottish snowfield

Delta is number of days from April 1st each year (these fields melt before winter)