Thanks for all your efforts Espen, I have enjoyed your posts for a long time and wanted to voice my appreciation.
The other day I was toggling between 2013 and 2014 and noticed that the melt ponds didn't seem to move, but being just one year apart, I didn't think any more about it, until seeing your wonderful post!. It's remarkable how consistent they are, 20 years apart. It reminds me of the rivers features when whitewater rafting. The waves, holes, hydraulics, eddies, etc..., are always in the same spot, and are caused by the shape, and features of the river bed. Just a thought.
I also noticed when toggling between consecutive days, some ponds seem to disappear overnight, often in clusters. Only to reappear again.