Using 3DReshaper we have by far, the easiest way to extract ground points for generating contour lines from a point cloud. Watch the 3 minute video here.
Simply hit the ground extractor, generate your Digital Terrain Model (DTM), and create contour lines. No pre-cleaning of the cloud required. Contour lines can then be imported directly into AutoCAD. Buildings, fences, bushes, trees, are all removed automatically.
Questions about 3DReshaper? Talk to me: firstname.lastname@example.org