More Koppen

Testing out the new wind algorithm. With a perfectly flat world, we get the following Koppen distribution.

It's interesting that Af (tropical forest) butts right up against Cfa (temperate). This has to do with the heavy rain sweeping across the Af areas - on the border with Cfa, the temperature drops (and changes the category) but the precipitation does not change in kind. This leads to an odd boundary, but it's not unheard of in the wild. I'd just like to see a few more A categories, so I need to tweak the amount of precipitation.

I also am considering the mode smoothing discussed here. I think that might help the artistic effect at least.