I was looking at the possibility to redo the kneemaps and since I'm busy with ODS for now, I started playing with my background images
The idea is to get them looking like the ONC (or TPC) charts, just like this one:

If I do this I will update all my kneemaps with the new color code.
The goal behind all this is to draw the FIR, ADIZ, and the restricted and prohibited zones that I use on my approach charts.
We may even consider using those as UI maps
here's the intial color playing: I'm not happy with it yet....

What would be the ideal size? 4096x4096 or 2048x2048
Your comments are welcome