If you played at Hunting brunch you could spot some planets have maze-like surface. I think first it’s complex rules of biomes’ generation, but devs actually used bitmaps for this. If you imagine about entire city planet as Coruscant, you could help to draw height map for this world. It need to be square 4608×4608 px (or actually n×1536 × n×1536 px) grayscale .png map.
I want to draw such map but have no enought time. So you could try to make your own one.
Here are few pictures for inspiring: