Unless you are working for a global military force, a global extractive industries company, a global logistics company, or some other well funded entity that has a legitimate need for a full Earth solution, my suggestion is: Don’t.
The Earth is actually unimaginably vast. It’s gigantic. You could travel at 100 miles an hour with a 1 mile viewing area, for a 100 year lifetime, and only see 1% of its surface.
Gameplay not only does not need this vastness; this vastness is explicitly bad for gameplay.