Painting data onto terrain

I have an interest in data being painted onto terrain. I know about TerrainPaintUtility and know you can create custom tools, which is something I plan to look into. Wondering if anyone else has had to grapple with this sort of thing?

Edit: Also trying to figure out how I could visualize this information on the terrain.

There are a lot of potential uses, such as painting weight maps for encounter probabilities, debuffs to player movement, reward probabilities, etc. etc.

Has anyone delved into this sort of thing? What sort of solutions did you come up with?