Before you can analyze a surface, you have to make one. To the land development company today, this can mean pulling information from a large number of sources, including Internet sources, old drawings, and fieldwork. Working with each requires some level of knowledge about the reliability of the information and how to handle it in Civil 3D. In this section, we’ll look at how you can obtain data from a couple of free sources and bring it into your drawing, create new surfaces, and make a volume surface.
Before creating surfaces, you need to know a bit about the components that can be used as part of a surface definition: