These maps are based on those from Heavy Harmonies. The maps there were fed into a script that parsed them and inserted the result into a MySQL database. Another script then reads the database and generates an SVG file. That SVG file is then converted into a PNG by ImageMagick.
It is reasonable to wonder why the world needs more Avatar maps when there already are several sets available (there are some at cyber1.org as well). The primary motivation is that those maps are, for the version of Avatar on cyber1.org, wrong. I wanted maps that the community of players (including myself) could update easily. To achieve the latter it meant getting the map data into a database and automating the map creation process.
Anyone visiting the site can update them. Click on Editing here or on the top of any page for details on how. If you encounter any problems please let me know via p-note to turner / nova / cyber1. A list of all changes made thus far is available.
Um, yeah, that's from Heavy Harmonies, labeled as "15-B". It probably doesn't exist in cyber1's Avatar. Since I don't run 15 yet, I wouldn't know. If you can confirm or deny its existence, let me know.