Great idea, Brian. I tried using Gaia to create the slope colors on two different plots of land, and came up with this:
https://imgur.com/Ei0CKsv
https://imgur.com/VntCMSO
The first plot has more "natural" green sites, while the second plot is more rugged. Gaia allows you set both minimum and maximum slope values for each texture, so it worked really well. Here's my color code, along with the settings in Gaia:
Tan - 0 degree slope. Gaia - Min = 0 Max = 0.5
Yellow - 1 degree slope. Gaia - Min = 0.5 Max = 1.8
Orange - 2 degree slope. Gaia - Min = 1.8 Max = 2.8
Red - 3 degree slope. Gaia - Min = 2.8. Max = 3.5
Brown - 4 thru 7 degree slopes. Gaia - Min = 3.5 Max = 7
Purple - 8 thru 90 degree slopes. Gaia = Min = 7 Max 90
The values in Gaia were determined thru trial and error. The Brown zone is an area that is too steep for a pin, but ok for a fairway cross slope. You'd probably have a hard time keeping a drive in the fairway that is steeper than around 7 degrees. Regeneration of the colors after making terrain changes takes 30-60 seconds.
I also like how it inspires the drawing of unusual shapes, to match the actual terrain.
As a side note: Gaia allows you to spawn textures based on height, so here's the color concept applied to that:
https://imgur.com/B9neEgg
https://imgur.com/J53GvBn
The first image is just a 0-100 meter slope, showing my color scale, while the second image shows a hilly plot of land. I wish Course Forge could generate topo lines from any given terrain, but until that happens, this color map will have to do.
David