There are five categories available as options in the Terrain Settings tab:
Base terrain
Tree and detail objects
Wind settings
Resolution
Heightmap
Each of them modifies their corresponding tools that we've looked at earlier.
We will avoid talking about Wind Setting and Wind Zones in general due to their limited application within Unity. However, here is what the other categories have to offer.
As you have probably guessed, this modifies properties of the terrain.
Draw checkbox toggles terrain rendering.
Pixel Error controls how accurately generated terrain will follow mapping; this parameter is essentially a tessellation for the terrain: the higher the value, the more polygons the terrain will use to represent applied mapping (height, textures…), and the faster it will lose polycount based on camera distance.
Base Map Distance is a threshold at which terrain textures switch from full resolution to lower resolution.