AutoCAD® Civil 3D® 2012 Essentials: Autodesk® Official Training Guide: Essential

Editing Surfaces

With the inclusion of points and breaklines in the surface, you have essentially provided all the data that will be needed to create the surface model. However, you should continue manipulating this data until you achieve the most accurate representation of the existing ground surface possible. You can edit surfaces in many ways. In this section, you will learn about three surface editing methods: adding boundaries, deleting lines, and editing points.

Adding Boundaries

As discussed earlier, boundaries are a way of defining where the surface is and where it is not. In the example project, you do not want the surface to exist