Attempting to make a very large & low detailed map with a high detail center

Basically in the game for class I am making, it consists of a flyover opening sequence that zooms to the characters head. The zoom over goes over a lot of low detailed space from high up, and the character itself can see out across the low detail landscape but is stuck in the high detail area. Is there a way to keep terrain detail high in a confined area and low detail blocks of terrain all around it?

Thank you for your time.

Terrain does this by default. As terrain gets further from the camera, its polygon count lowers.

You can change the pixel error to make this effect lesser or greater.