Aerial Shot of Ground & Sky with Horizon


I’ve been trying to make a scene that features an aircraft with a realistic looking sky & ground, and a relatively visible horizon between the two.

I’ve used an addon to create the sky, but I have absolutely no idea where to start with making the ground. Have not been able to find any tutorials for this sort of thing online.

Here is what I have so far:

And the general POV I’m after:

Any suggestions as to where to start would be appreciated. I’m struggling to make anything that doesn’t have a very sharp end to the ‘ground’ making it look very unrealistic.

Thanks in advance!

camera projection would be the best bet as long as ur not planning on going too close.