System for joining elements to complex junctions and links in road network representation for vehicles
First Claim
1. A method for storing geographical road data in multiple hierarchically organized levels by from a relatively lower level that features detailed representations of road links and junctions, deriving at a relatively globalized level an abstracted representation from such detailed representations, characterized by the steps of:
- a. at such lower level, joining a set of elementary junctions to a complex junction on the basis of predetermined coherencies among the elementary junctions of the set;
b. repeating step a. until all complex junctions have been found;
c. ascertaining all border elements of a particular set and all elementary external links between those border elements and any element of one particular other set, inclusive of all allowed traffic directions on such elementary external road links, and collectively replacing said elementary external road links by a single complex external road link while mapping said allowed traffic directions thereon;
d. repeating step c. until all complex external road links between sets so paired have been found;
e. representing each remaining elementary junction and each complex junction by a respective single node, while representing each remaining elementary external road link and each complex external road link by a single higher level road link with associated original or mapped traffic directions, respectively.
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Accused Products
Abstract
Road data is stored in hierarchically organized levels. A lower level has detailed representations of road links and junctions. At a globalized level an abstracted representation is derived: a set of elementary junctions is joined to a complex junction on the basis of predetermined coherencies among the elements of the set. This repeats until all complex junctions have been found. All external road links between a border element of a particular set and any element of a particular neighboring set are detected, including allowed traffic directions on the external road links. The links are collected to a single complex road link while mapping the allowed traffic directions thereon. This repeats until all complex road links have been found. Remaining elementary and complex junction are represented by a respective single node. Also, each remaining elementary and complex road link is represented by a single higher level road link.
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Citations
18 Claims
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1. A method for storing geographical road data in multiple hierarchically organized levels by from a relatively lower level that features detailed representations of road links and junctions, deriving at a relatively globalized level an abstracted representation from such detailed representations, characterized by the steps of:
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a. at such lower level, joining a set of elementary junctions to a complex junction on the basis of predetermined coherencies among the elementary junctions of the set; b. repeating step a. until all complex junctions have been found; c. ascertaining all border elements of a particular set and all elementary external links between those border elements and any element of one particular other set, inclusive of all allowed traffic directions on such elementary external road links, and collectively replacing said elementary external road links by a single complex external road link while mapping said allowed traffic directions thereon; d. repeating step c. until all complex external road links between sets so paired have been found; e. representing each remaining elementary junction and each complex junction by a respective single node, while representing each remaining elementary external road link and each complex external road link by a single higher level road link with associated original or mapped traffic directions, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A data processing system for processing and storing geographical road data in multiple hierarchically organized levels by from a relatively lower level that features detailed representations of road links and junctions, deriving at a relatively globalized level an abstracted representation from such detailed representations, said system comprising:
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a. joining means for, at such lower level, joining a set of elementary junctions to a complex junction on the basis of predetermined coherencies among the elementary junctions of the set; b. first sequencer means for cyclically activating the joining means of item a. until all complex junctions have been found; c. ascertaining means for ascertaining all border elements of a particular set and all elementary external links between those border elements and any element of a particular other set, inclusive of all allowed traffic directions on such elementary external road links, and collectively replacing said elementary external road links by a single complex external road link while mapping said allowed traffic directions thereon; d. second sequencer means for cyclically activating the ascertaining means of item c. until all complex external road links between sets so paired have been found; e. representing means for representing each remaining elementary junction and each complex junction by a respective single node, while representing each remaining elementary external road link and each complex external road link by a single higher level road link with associated original or mapped traffic directions, respectively.
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Specification