Routing on ITN using ESRI's ArcGIS® Network Analyst

GO Loader provides a unique way to depict the OS MasterMap ITN Layer. Unlike other tools, GO Loader generates linework that provides an accurate cartographic representation of a restriction, clearly identifying how it applies to the roadnetwork and how it could potentially affect the user. This clear and precise representation is essential when a traveller needs to be able to change direction based on the re-routing requirements, particularly when time is of essence as is the case with emergency vehicles.

Network Analyst from ESRI® turns the ITN layer into a logical network. It enables the user to set up weightings such as: traffic density, roadworks, temporal restrictions etc. By utilizing these capabilities with GO Loader's complex geometry processing capabilities, users can now easily:

• Define the shortest route
• Plot travel directions
• Chart drive time analysis

across the entire ITN Network, with full support for turns and one-way restrictions.

Travelling from Point 1 to Point 2

In the above example of a true scenario, there is a no right turn restriction for all cars attempting to travel from Cumberland Place to the south, past the cenotaph and the park. Utilising the Network Analyst tool, users are directed back round Cumberland Place to access the destination from the south.

The resultant planned route is high lighted in green. The blue and red symbols represent the Road Restriction Information as displayed by the GO Loader ITN tool.