Feature Layer Basics

Characteristic

Short description

Use

To handle different kind of additional routing relevant information, Feature Layer allows the definition of multiple layers. Each of these layers carries information which is important for and has influence on routing. The layers can be combined, individually selected and prioritized. Conflict-handling mechanisms ensure that more important layers, e.g. preferred routes, have a stronger impact on routing than layers with lower priority, e.g. restriction zones. For a client-side request one can define which layers are to be considered, and how, e.g. prioritization of several layers.

Detailed Consideration

The Feature Layer data can be separated into tree different kinds:

The following list summarizes the Feature Layers which are currently available:

Static Feature Layers

Layer Description Use Cases
PTV_PreferredRoutes

This Feature Layer contains a prioritized road network or rather routes for certain vehicleClosed The term vehicle describes what is being routed or planned for. Vehicles are used in route calculation, distance matrix calculation and effectively also in tour planning. In route calculation, vehicle properties like overall size, weight and speed are in focus. In tour planning, it is vehicle properties like capacity and availability. Commonly a vehicle is motorized, like a truck - including its trailer or a car. However also a bike or even a pedestrian are included in this definition. types like trucks with special loads or heavy vehicles. Preferred routes are crucial in USA and Australia but become more and more relevant in Europe. E.g. the inner city of Munich has to be detoured if not delivering directly.

Hazardous goods transports, long trucks, heavy load transport, oversize cargo, etc.

PTV_RestrictionZones

This layer provides zones and road sections that are restricted for through traffic. As part of the EU regulations on limits for air pollutants, various regions and cities installed so-called clean air and action plans, which also include the prohibition of transit for specific vehicle types, e.g. trucks larger than 7.5t. Entering the zone is then only allowed if origin or destination is located within, otherwise they have to be circumnavigated:

The layer can also handle restricted road sections that depend on the region-based location of the origin and destination points. This kind of restriction is mainly used in Austria where some roads can only be taken for specific vehicle types depending on their waypoint location. In order to be able to take the restricted road, at least the origin and/or destination points have to be located in a specific region declared by the government.

By nature, this Feature Layer cannot be used for matrix calculation, as a restriction zone cannot be allowed and forbidden simultaneously during the Dijkstra expansion.

Through traffic

Example | Behavior of a free-for-delivery-zone

Restricted road section

Example | Behavior of a restricted road that depends on the region-based location of the origin and destination points
PTV_SpeedPatterns

This layer provides statistical and time dependent absolute speeds for a given set of road segments, that can be used by route calculation instead of the NC/SC speed defined by the vehicle profileClosed A profile is a collection of parameters used to configure the request. Full profiles consist of a number of specialized sub-profiles like the VehicleProfile which describes the properties of a vehicle.. I.e. the used vehicle speed may vary according the current travel time. Transfer of past traffic patterns per road segment show the expected Level Of Service LOS in the future. This forecast helps to recognize and avoid traffic jams or at least include the anticipated time loss into the estimated time of arrival.

As soon as real-time Dynamic Traffic Information is available as an additional Feature Layer, it can be combined with the historic traffic patterns. The combination of forecasted and actual traffic information result in a more precise view of the near future, for example road works in combination with a traffic jam as the result of an accident.

Optional: The speed patterns can be adapted to specialized vehicle types like trucks, for example.

Routing with historical traffic data.

PTV_TimeZones - time zone information

This layer provides time zone information at a given location. This information is necessary to consider time dependent restrictions correctly in the route planning, for example temporary road closures and road works. Different time zones can be considered in routing and estimated time of arrival calculation. Time zones can be precisely displayed, especially in connection with historical traffic information and traffic patterns.

Time zone information will not be rendered at all. But it is always available for all other Feature Layers, which need access for it, so it never has to be enabled explicitly in the requests.

Output of the correct local ETAClosed ETA (Estimated Time of Arrival) is the time when a ship, vehicle, aircraft, cargo or emergency service is expected to arrive at a certain place. for transports crossing time zones.

PTV_TruckAttributes

This layer provides truck-specific driving restrictions. These features concern the dimension, the weight or the type of the vehicle. This could be important for the clearance height of tunnels or the weight restriction of bridges. This Feature Layer is fairly often combined with time dependent restrictions. So, the features are only valid during a certain period of time. The truck attributes are considered in the routing or in distance matrix calculation. Therefore you gain more accuracy and a better planning basis. Truck attributes can be displayed on segment basis or as icons.

Routing with restriction data specialized for trucks.

PTV_LowEmissionZones

This layer contains driving restrictions related to low emission zones that prohibit access to the most polluting vehicles. Entering a zone can only be done under specific conditions. Depending on the country, the criteria are different. Some countries use an emission sticker. If the vehicle has the correct sticker, it can enter the zone. Other countries use the EURO emission level property. Vehicles below a certain EU norm are not allowed to enter the low emission zone.

Environmentally conscious routing.

Dynamic Feature Layers

Layer Description Use Cases
PTV_TrafficIncidents

This Feature Layer provides real time or forecasted traffic events, such as traffic jams, construction sites or temporary road closures. Traffic events are considered in route calculations and can be displayed, similar to PTV_TruckAttributes, on segment basis or as icons.

Routing with real-time traffic, e.g. for calculation of estimated time of arrival.

Custom Feature Layers

Layer Description Use Cases
PTV_RoadAttributes

Users can design their own custom Feature Layers by selecting road segments to access data and by defining their own Feature Layer Attributes as described in PTV_RoadAttributes.

Routing with user-defined restrictions.

Technical Concept GDF time domains
Technical Concept Feature Layer attributes
Technical Concept Custom Feature Layers