What it does
Re-textures Jool to give it a Great Green Spot.
Adds four distinct biomes to Jool, with their own distinct science definitions.
The biomes roughly follow the patterns of Jool's cloud bands, and are:
Equatorial Cloud Belt
Temperate Cloud Belt
Polar Cloud Belt
Great Green Spot
Note that you still can't land on Jool (it's a gas giant!), so the biomes are only useful for space and atmospheric science.
Download from SpaceDock License