Routing point overview

To meet customer needs a fully routable modal network is being created. A key element of this is to provide more usable data about the access to destinations. As a result, we are now directly splitting our road, track and path data where Access Links connect to the network. This will allow users to more easily route into sites using OS network data.

As nodes have now been created within the networks data, where Access Link features connect, there is now no requirement for Decision Node features and they are being removed from the Sites products.

The OS MasterMap Sites Layer data model is designed to integrate with OS MasterMap Highways Network. Routing points are intended to provide users with a reference to the position that is close to an access point, which can be used to aid navigation to the access point via the Highways road network. The routing points are provided where there is no viable Highways Network road node feature to refer to directly from an access point.

Routing points are currently being created by an automated process that performs a spatial query to identify the nearest position on the closest Highways Network road link feature. The process also ensures that there is no viable road node on the selected road link using a 5-metre tolerance before generating a routing point.

Routing points supplied in the initial release of OS MasterMap Sites Layer are created from the

OS MasterMap Highways Network – Roads product but still reference the ITN road network. In addition to the OS MasterMap Highways Network – Roads data, we have applied OS MasterMap Highways Network – Paths data.

The process will be subject to continuous revision between releases to improve its results.

Example of a routing point (red)