Transportation Network Representations - A comparison of a few approaches
| USGS DLG | Census TIGER GML3 | GDF | vtRoadMap | Paramics | EDF | ||
|---|---|---|---|---|---|---|---|
| Road geometry | Centerline modelled as a Polyline, called Line | ..todo.. | Multi-level, so at Level 0,1,2 Roads are modelling as Complexes, Lines, or Edges | Centerline modelled as a Polyline, called Link | Modelled as a pair of Links (one for each direction of traffic) Each Link can be a straight line connecting two Nodes or defined by Centres (Arcs - center/radius) |
Centerline modelled as Segments: a hierarchical set of curves (straight, curved, generalized cubic curve) | |
| Road width | attribute on Line, almost never used | attribute of Road Element | Property of Link | Property of Link | Property of Segment (two widths: left and right of centerline) |
||
| Lanes | attribute on Line, almost never used | no? | attribute of Road Element | Property of Link: number of lanes, but no lane descriptions (lane positions are guessed at runtime) | Property of Link | Road object references each Segment, contains a set of Lane descriptions, each with type and width | |
| Street Names | no | yes | yes | no | no | no? | |
| Street Addresses | no | yes | yes | no | no | no? | |
| Surface Type | no, although paved/unpaved can be somewhat implied from Road Class | no? | Paved or unpaved. | Paved, dirt, gravel, etc. | |||
| Intersections | A point, called Node | Level 2: Complex, called Intersection Level 1: A point, called Junction |
A point, called Node | A point, called Node | Polygonal area (convex) called Intersection | ||
| Sidewalks, parking, other non-driving road areas | no | no? | Simple flags on Link (e.g. sidewalk yes/no) |
no? | Modelled as Lanes | ||
| Lane connectivity | no | yes? | no | defined by Junction object and Nextlanes info | Set of Corridors (centerline curve of path) associated with each Intersection | ||
| Stop lines and curbs | no | no (must be guessed at runtime) | defined by Kerb and Stop Lines objects | Property of Corridor | |||
| Internal constraints | no | no | Restrictions info | Properties of Corridor | |||
| Traffic control | no | no? | simple flag (2 flags: start and end of each Link) | Complete specification using Priorities info | Complete specification (properties on Corridor and Intersection) | ||
| Lanes splitting/ merging |
no | no (abrupt) | ? | yes, explicitly supported | |||