(devs, halp ! )Overhaul of a map and map artifacts remaining

[arkhiel]

Hi !
So I'm trying to make a whole new map, I'm for now trying to clean it, wether renaming some of the leveldata files in newland folder , or just suppressing with world editor.
I made for now a whole flat world, all in great desert area, covering the whole map, and taken the border zone biome to all the map.
Also made the flowmap orange, ambient map transparent, same for blendmap, welp, can't see what i can do next.

Thing is, I can overall get the wished foliage, the wished climate, but I still have "wet ground", for example in north west ground has robot spider foliage and like "oil" painted (not from the overlay ! ), swamp still have huge trees that are not placeable, ground is wet there as well.

In short, even with a total overlay, new map etc I'm stuck on this kind of stuff I can't control.

Is there some hardcoded overlay or something ?

Thanks

[arkhiel]

OK so found out a few answers :
-Biome maps aren't used, they're like integrated in game, so they're more a guide if anything.
You can edit biomes in FCS but have to deal with zoning as it is (or at least haven't found how to change that).
Clutter from swamp could be removed editing each swamp related biome.

-Ambient map does work, dictated the green zone in swamps I couldn't figure how to remove.

Haven't figured how to tweak grass/ground/base layers , slope and cliff at least appear with height variation.

-roads are tweaked through new overlays, so possible to remove/edit/add. One can imagine a paved ground for a city.