Method for model construction for a travel-time database
First Claim
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1. A method for creating a model for a travel time database, comprising:
- providing a leg network comprising leg sections between a starting point and a destination point;
ascertaining a plurality of possible routes between the starting point and the destination point, wherein each route comprises leg sections including at least one of the leg sections of the leg network;
ascertaining a respective relative travel time loss for each leg section of each route with a respective traffic characteristic on each leg section of each route;
associating the ascertained relative travel time losses of the leg sections of the routes with each leg section of the leg network;
ascertaining a respective weighting of the relative travel time losses for each leg section of each route with a respective traffic characteristic on each leg section of each route;
associating the ascertained weightings of the leg sections of the routes with each leg section of the leg network; and
ascertaining a probability distribution of the relative travel time losses for each leg section of the leg network with the traffic characteristic associated with the respective leg section and a calibration parameter associated with the respective leg section,wherein the respective relative travel time loss is ascertained as a function of the travel time measured between the starting point and the destination point and a minimum travel time predefined on the respective leg section of each route between the starting point and the destination point,wherein the minimum travel time between the starting point and the destination point is ascertained from a sum of respective free travel times associated with the leg sections of the route, andwherein a free travel time associated with the respective leg section is ascertained as a function of the length of the respective leg section of the route and the free travel speed associated with the respective leg section of the route.
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Abstract
According to a method for creating a model for a travel time database, a leg network comprising leg sections between a starting point and a destination point are analyzed. Multiple routes are ascertained between the starting and destination points. Each leg section of a route is associated with a relative travel time loss and is weighted. The ascertained travel time losses and the associated weightings are used as input data for a learning method by way of which an existing knowledge base is iteratively expanded.
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Citations
11 Claims
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1. A method for creating a model for a travel time database, comprising:
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providing a leg network comprising leg sections between a starting point and a destination point; ascertaining a plurality of possible routes between the starting point and the destination point, wherein each route comprises leg sections including at least one of the leg sections of the leg network; ascertaining a respective relative travel time loss for each leg section of each route with a respective traffic characteristic on each leg section of each route; associating the ascertained relative travel time losses of the leg sections of the routes with each leg section of the leg network; ascertaining a respective weighting of the relative travel time losses for each leg section of each route with a respective traffic characteristic on each leg section of each route; associating the ascertained weightings of the leg sections of the routes with each leg section of the leg network; and ascertaining a probability distribution of the relative travel time losses for each leg section of the leg network with the traffic characteristic associated with the respective leg section and a calibration parameter associated with the respective leg section, wherein the respective relative travel time loss is ascertained as a function of the travel time measured between the starting point and the destination point and a minimum travel time predefined on the respective leg section of each route between the starting point and the destination point, wherein the minimum travel time between the starting point and the destination point is ascertained from a sum of respective free travel times associated with the leg sections of the route, and wherein a free travel time associated with the respective leg section is ascertained as a function of the length of the respective leg section of the route and the free travel speed associated with the respective leg section of the route. - View Dependent Claims (2, 3, 4, 8, 9, 10, 11)
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5. A method for creating a model for a travel time database, comprising:
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providing a leg network comprising leg sections between a starting point and a destination point; ascertaining a plurality of possible routes between the starting point and the destination point, wherein each route comprises leg sections including at least one of the leg sections of the leg network; ascertaining a respective relative travel time loss for each leg section of each route with a respective traffic characteristic on each leg section of each route; associating the ascertained relative travel time losses of the leg sections of the routes with each leg section of the leg network; ascertaining a respective weighting of the relative travel time losses for each leg section of each route with a respective traffic characteristic on each leg section of each route; associating the ascertained weightings of the leg sections of the routes with each leg section of the leg network; and ascertaining a probability distribution of the relative travel time losses for each leg section of the leg network with the traffic characteristic associated with the respective leg section and a calibration parameter associated with the respective leg section; ascertaining an expected travel time value for each of the ascertained routes; and ascertaining the respective weighting of the relative travel time losses for each leg section of each route as a function of the ascertained expected travel time values.
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6. A method comprising:
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ascertaining, by a processor of a computer, a probability distribution model of relative travel time losses for each leg section of a leg network with a respective traffic characteristic on each leg section of the leg network by evaluating a predefined travel time database; ascertaining, by the processor of the computer, a plurality of possible routes and ascertaining the respective relative travel time losses on each leg section of the routes by the processor repeating the following acts (a) to (c) multiple times; (a) ascertaining a random travel time on each leg section of the leg network by applying the probability distribution model and associating each of a randomly ascertained travel times with each leg section of the leg network; (b) ascertaining a temporally shortest route between a starting point and a destination point based on the travel times associated with the leg sections of the leg network; and (c) ascertaining the relative travel time losses of the respective leg sections of the temporally shortest route. - View Dependent Claims (7)
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Specification