You can begin creating and altering parcels after watching these instructions. In Autodesk Civil 3D, parcel objects are frequently used to represent real estate properties, such as lots in a development. In Autodesk Civil 3D, parcel objects are frequently used to represent real estate properties, such as lots in a development. Referring to Parcel Components. The perimeter of a parcel is a closed polygon. Nodes are the places where line segments converge. Line and curve segments are the two types available.