Each of these elements will also possess attributes required in the routing process. Network links are simply the arcs one wishes to be eligible as a potential part of a route. Arc attributes are used in this procedure. For example, only Interstate, U.S., and State Highways may wish to be selected for determining routes for long distance travel. An arc attribute is also employed by the network model for defining impedance values.
Impedance refers to the relative ease or difficulty to traverse any given arc.
Routes are determined by ArcInfo by the least possible impedance to go from one point to another. For example, an impedance may be desired of routes depicting the least amount of TIME for travel. Another element used in routing is the network node. If impedance wish to be included at these points, they must be shown in a turntable, which is an INFO file depicting all possible turns from one arc to another. The last element required in routing are stops, which are the node links representing the locations to be visited along a desired route.