A digitized line marking the center of a linear land feature, i e roads and rivers
Linear feature representing the midpoint along a linear element like a road or stream
For a two-lane highway the centerline is the middle of the traveled way, and for a divided highway the centerline may be the center of the median For divided highway with independent roadways, each roadway has its own centerline (4)
the imaginary line that passes through the center of the lens surface and that is perpendicular to the surface of the lens at that spot; also called the optical axis of the lens concave: a surface that curves in on itself, like the inside of a bowl concave lens: a lens that is thicker at the edges than at the center converge: to move together toward a central point When light rays from an object converge, they form an image of the object convex: a surface that curves outward, like the outside of a bowl convex lens: a lens that is thicker at the center than at the edges curvature: a measure of the amount of curving The curvature of a lens is what causes light rays to bend
An imaginary line running through the center of a part along its axis, e g , the centerline of a crankshaft running from front-to-back directly through the center of the main-bearing journals
A linear spatial object (arc) created to allow for the topological connectivity through 2-D features Centerlines always become 1-D artificial path basic features