Awesome!!

I finally did it:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2961563719
Switched from linear regression to polynomial regression. The points looked good but the map was still glitchy. Was nearly about to give up when I found that the edge pixels of the tiles need to overlap. After duplicating the pixel rows everything lined up nearly perfect.

Very cool, yeah I've tried a few times myself, but it's nearly impossible when you are just working with the images trying to blend the edges.

Fixing the edges of height maps turned out harder than expected. I tried it with a simple linear regression. Only worked on terrain with a constant gradient.
I'll be on vacation for the next two weeks. Will do another attempt when I'm back in April.

That would be awesome. Yeah ... it drops you there when you start in Creative. I really wish there was a planet generator for this game. I'd like to customize some with new terrain. So far I've only been playing with a few new textures.

Actually not a bad idea. If you spawn into a new solar system without a spawn ship the game places you at a specific spot on earth like that has these glitchy borders.

I'm currently writing some edge fixing code for my procedural planet generator. I could use that code to fix the existing game files. Might be worth a try. If it works I'll upload it as a separate mod.

Now if someone would fix the terrain border mis-match so there aren't sheer cliffs or drops where the EarthLike/Alien terrain files meet.