They include walkways, streets, railroads, expressways, and mass transit lines. These are typically the perspective from which an observer views the city. Edges are linear, not unlike paths, but do not facilitate movement. They are often boundaries defining a break in continuity between two homogeneous regions. Examples include shores, walls, rivers, and railroads cuts.
Districts are the mid-sized sections of a city.
They are distinguishable as having some common, identifying characteristics. Typical identifying traits include a particular architectural style, light posts, or mailboxes. Nodes are strategic spots in the city where observers can enter. They are typically linked to travel and may be represented by some type of transportation hub such as a mass transit station, bus stop, or traffic circle. Landmarks are point-references which are external to the observer.