The biomes of Nasvene are determined by the influence of the four elemental planes. So obviously, I had the idea to create four "influence heightmaps", overlay them, and determine the resulting biomes on a pixel by pixel basis.

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MS: Just determine groups of biomes and assign them to rules based on the influence %'s

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PoA:

1. Create program to generate each planar influence map

2. Create program to interpret planar influence maps to ensure they always add up to 100%

3. Compile all influence combinations that show up

4. Assign associated biomes to groups of influence combinations

5. Output biome map