ture.
Regions are defined as a set of polygons.
To represent transportation networks, ArcInfo uses the previous feature classes as the basis of the NETWORK data model. The model consists of:
- network links representing the interconnected linear entities that are the conduits for transportation, they are modeLED as ArcInfo arcs; links are bidirectional (by the means of from-to and to-from link impedances: if the impedance is positive, then flow can travel in that direction, if it is negative, the flow is forbidden); the network link attributes are stored in the arc attribute table (AAT);
- network nodes representing the endpoints of network links; they are modeLED as ArcInfo nodes; the node attributes are stored in the node attribute table (NAT);
- stops, which are nodes representing locations visited in a path (shortest path algorithm) or tour (traveling salesman problem); stops and stop attributes are maintained in INFO files, referred to as stop files;
- centers, which are nodes representing resource supply or some type of attraction; centers and center attributes are maintained in INFO files, referred to as center files;
- turns representing transitions from one network link to another network link at nodes; turns are listed and maintained separately in a coverage INFO file calLED a turntable (TRN).
Since the transit system uses some of the arcs of the transportation network and is defined by different data attributes, it is best represented by dynamic segmentation (route-system and events). It is composed of the following elements:
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