Terrain Grading Function

	The Grading Function allows a 3D feature to be projected on to a target surface (topography). The user can specify cut/fill slope angles. Objects can be either linear features or polygons. The top of cut/toe of fill is automatically calculated and slope lines are constructed. The graded surface can be automatically merged into the existing surface. Cut and fill volumes can be easily calculated.
	Typical applications include design of building pads, ponds, camp grounds, log dumps, road intersections, parking lots etc.