I'm looking for methods to remove/smooth roads and their associated ditches within a LiDAR DEM. I was trying ArcHydro's DEM reconditioning tool to lower the roads and raise the ditches using the road network shapefile but the outputs were not very satisfactory. I don't have the original LiDAR points but I was thinking of extracting the elevation data from each cell (1m2) to points, removing all points along the roads and ditches and then re-creating the DEM. The previous roads would be re-interpolated from the other points causing them to be smoothed out. Any suggestions would be greatly appreciated.