This is the script that was used to generate Minecraft
Antarctica. Feel free to use as a base
for your own creations. This is unsupported code - it worked for me when I
needed it to. The code is MIT licensed, details are in LICENSE.md.
The script uses a few external libraries. The Minecraft file format is handled
by pymclevel, which you'll have to install from Github.
The underlying data is Bedmap2. You'll want the TIFF version, available here.