The LevelCode value is used to indicate when a route is above or below normal ground level. The attribute is only applied where the level difference extends for distances greater than approximately 50m.
Routes that cross at different levels are not split at the intersection; those that are in tunnels or on bridges less than 50m long are given the default LevelCode attribute of Surface Level.
| Value | Description |
|---|---|
The LevelCode value is used to indicate when a route is above or below normal ground level. The attribute is only applied where the level difference extends for distances greater than approximately 50m.
Routes that cross at different levels are not split at the intersection; those that are in tunnels or on bridges less than 50m long are given the default LevelCode attribute of Surface Level.
Above surface level on structure – example
Below surface level tunnel – example
Surface Level
The route is at the same level as the surrounding terrain. This is the default value for RouteLink features.
Above Surface Level On Structure
The RouteLink is supported or suspended above ground level on a manmade structure that extends for more than 50m.
For example, a road, track or path may be on a bridge, footbridge or viaduct (Figure 6).
Below Surface Level Tunnel
The route passes through a specially built construction underneath the normal terrain surface primarily to avoid or reduce the effect of the terrain surface or to avoid an obstruction such as a river or mountain (Figure 7) and extends for more than 50m.
