How do I smooth out smooth terrain via script?

So I've figured out how to take U.S. Geological Survey Data Elevation Models, and import them into Roblox via script. I've imported Mount Everest and Surrounding Himalayan Mountains, but it is really rugged. I made it 3 blocks thick, to smooth it out a little and remove holes, but that hasn't helped entirely.

Is smoothing-out smooth-terrain possible? If so, could you link any information available on the topic?

Here is another guy with the same problem.

EDIT: I think Terrain:AutoWedgeCells(Region3int16) could help, but it doesn't do anything when I try it:

game.Workspace.Terrain:AutowedgeCells(Region3int16.new(Vector3int16.new(-69, 2.5, 39), Vector3int16.new(61, 77.5, -38)))

No smooth terrain :(