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

Connecting Objects to Objects

Probably the most important type of relationship that you'll see in this chapter is the one between objects. A typical land development project is a collection of dozens of mini-designs that often tie in to one another. For example, a road is designed by first drawing the 2D path of its centerline, then the proposed changes in elevation along that centerline, and finally the lanes, curbs, and sidewalks extending outward from that centerline. To provide drainage during a rainstorm, ditches must be installed along the sides of the road. The location and depth of these ditches can be traced back through the design process the whole way to the layout of the road centerline. If the layout of the centerline needs to change ...