I think that's about got it. One thing to keep in mind, points further north in your scene will have a shallower angle of approach the further they are from the camera and target positions, so it may still come to pass that some things at the extreme northern edge of the scene, as a whole, may end up being partially hidden by mountains and such. This, of course, depends on how much area you are rendering and how high above the land the camera is.

GW