How can I import real-world height data into Roblox? (Not using heightmaps!)

Hi everybody,
For the past year or so I’ve been developing a flight simulator. The land in-game is all based on real-world height data, however I have to spend ages using a plugin in Blender to create it and fix all the issues with it. The way I’m working now is very inefficient and doesn’t tend to work for larger portions of terrain.

I’d like to know how I could make this a bit easier for myself by just importing the height data from online and putting the data onto a flat plane using mesh deformation. I know that doing a similar thing by using parts has been done before on Widgeon’s AirX, so it is definitely possible.

If anybody knows how I could do this, that’d be great. Thanks!