How do I convert a non-closed line (think of it as a C) to a polygon filling the area in ArcMap?
I think I can convert a ring to a polygon with the Construct Polygon function on the Advanced Editing Toolbar. However I get the following error: "No polygons were created. Ensure the selected features form continuous rings and overlap the polygons."
Obviously, I need to make my C into an O. It's just a matter of adding a line segment between the two endpoints. How do I add that segment and make the line into a ring?