I'm working on mapping Welstar, one of the 6 worlds of RetroMUD

I started with the in game overworld map (which consists of multiple layers) took screenshots, stretched horizontally to compensate for the non-square characters used, and went to work in Inkscape.

The standard restack script that comes with Inkscape was nowhere near able to deal with over 6000 trees so I had to write my own. It's rather more limited as it operates only on clones within a group, assumes the clone templates are aligned with one another, and only sorts vertically, but it's MUCH faster and doesn't drop everything into the root of the document.

Click image for larger version. 

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And yes, I'm aware it doesn't look anything like a global map, but that's what the gods have provided.