Optimum route determination with tiling
First Claim
1. A system for optimum route determination, comprising:
- a first storage unit containing road segment data;
a second storage unit containing rank information data;
a working memory unit for storing a subset of the road segment data; and
a processing unit coupled to the working memory unit and adapted to determine an optimum route from a start point to a destination based on the rank information data, the rank information data for a road segment respectively being independent of a destination of the optimum route determination and indicating whether the road segment is contained in an optimum route having a start point located in a first tile of a tiling, the first tile having at least a distance defined by the rank information data.
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Abstract
An optimum route search may be conducted through the use of a tiling overlay on the network of road segments. Overlaying the tiling (grid) over the road segments allows for a reduction of the number of road segments considered for an optimum path as road segments can be evaluated on whether the road segment is part of an optimal path to the borders of a first tile and then successively larger frames of tiles around the initial tile. By reducing the number of road segments considered for the optimum route search to road segments that are part of optimal routes to various tile boundary edges, the computation of the optimum route for the route of interest may be quicker and less resource intensive than efforts to determine optimum routes through other methods.
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Citations
10 Claims
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1. A system for optimum route determination, comprising:
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a first storage unit containing road segment data; a second storage unit containing rank information data; a working memory unit for storing a subset of the road segment data; and a processing unit coupled to the working memory unit and adapted to determine an optimum route from a start point to a destination based on the rank information data, the rank information data for a road segment respectively being independent of a destination of the optimum route determination and indicating whether the road segment is contained in an optimum route having a start point located in a first tile of a tiling, the first tile having at least a distance defined by the rank information data. - View Dependent Claims (2, 3, 4)
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5. A system for optimum route determination, comprising:
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a first storage unit containing road segment data; a second storage unit containing rank information data; a working memory unit for storing a subset of the road segment data; and a processing unit coupled to the working memory unit and adapted to determine an optimum route from a start point to a destination based on the rank information data, the rank information data for a road segment stored in the second storage unit respectively being independent of a destination of the optimum route determination and indicating whether the road segment is contained in an optimum route having a start point located in a first tile of a tiling, the first tile being different from a tile of the tiling in which the road segment is located and the first tile having at least a distance defined by the rank information data from the tile of the tiling in which the road segment is located. - View Dependent Claims (6, 7)
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8. A navigation system for use in providing guidance on a suitable route for a vehicle comprising:
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an output unit; a position detection unit; a system for computing an optimum route from a start point to a destination through a use of a tiling applied to a network of road segments, the system for computing an optimum route utilizing a rank information value for a road segment, which rank information value is stored in a storage unit and is independent of a destination of the optimum route determination and indicates whether the road segment is contained in an optimum route having a start point located in a first tile of a tiling, the first tile being different from a tile of the tiling in which the road segment is located, and the first tile having at least a distance defined by the rank information value. - View Dependent Claims (9, 10)
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Specification