Below is the convention of using TerrainAxe.
Build objects with Meter,or some tools may not work properly.Set “System Unit Scale” to “Meters” or “Feet” in [System Unit setup],and modeling with real size.For example,if the real road width is 20 meters,then the amount of it should be set to 20, not 20000 or other number.
Convert objects to Editable poly.This is because most of the tools work with poly objects.You also need to know most tools have no effect on EditPoly modifier.
Remember that the farther the object is away from origin,the bigger the error gets. the center of scene must not be too far away from origin,otherwise the vertices position of an object is not correct,for example ,vertices of splines from AutoCAD is become jagging.