Scan Terrain will create an Autodesk® Revit® Toposurface from a laser scanned point cloud. Options are available to set the point spacing and to isolate the ground surface. When Isolating the ground surface, parameters are available to specify if the ground surface is flat, hilly, or mountainous and if the terrain has steps or steep slopes. These parameters help to ensure the ground surface is calculated correctly. There is also a command to add Toposurface points from the point cloud to an existing Toposurface with the option to delete the existing points in the area of newly added points.