Area Study Style Terrain Boundary

Selecting either of the terrain study display options shows a boundary that cannot be removed from the study.

This option drapes the study over the terrain opposed to looking flat. Below you will see the study at the edge is raised as it is on a hill. Having the boundary line helps define where the area boundary lies.

The boundary is meant as a helpful way to point out where the study boundary is in relation to the 3D view this style option provides.