Route Calculation Method and Device with Progressive Elimination of Data Corresponding to the Road Network
First Claim
1. A method of determining routes between a point of departure (a) and a point of arrival (β
- ) for a digital road mapping system consisting of a set of segments and nodes each having their importance index, said nodes and segments being put together so as to represent a road network formed of a plurality of meshes of different importance indices, each of the meshes being defined by a set of nodes of identical or greater value than a given value, defining an area, said method comprising the following steps;
a) via the segments, the nodes surrounding a departure node are scanned so as to determine the cost of each of these nodes;
b) said scanning is continued until the point of arrival of the route is reached;
c) during said scanning, the nodes are scanned so as to identify the nodes that can be used to form a mesh with a given starting index Id;
d) when a mesh with an index Id is identified, the segments whose index is less than this index Id are eliminated;
e) scanning the nodes continues so as to identify the nodes that can be used to form a new mesh, whose index Is is greater than that of the preceding mesh;
f) segments whose index is less than this new index Is are eliminated;
g) steps e and f are repeated until;
either the scanning enables the point of arrival of the route to be reached;
or a maximum index Im of elimination is reached.
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Abstract
A method of determining routes between a point of departure(a) and a point of arrival (β) comprising the following steps:
a) the nodes surrounding a departure node are scanned so as to determine the cost of each of these nodes;
b) said scanning is continued until the point of arrival of the route is reached;
c) during said scanning, the nodes are scanned so as to identify the nodes that can be used to form a mesh with a given starting index Id;
d) when a mesh with an index Id is identified, the nodes and segments whose index is less than this index Id are eliminated;
e) scanning the nodes continues so as to identify the nodes that can be used to form a new mesh, whose index Is is greater than that of the preceding mesh;
f) nodes and segments whose index is less than this new index Is are eliminated;
g) steps e and f are repeated until the desired elimination level is reached.
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Citations
13 Claims
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1. A method of determining routes between a point of departure (a) and a point of arrival (β
- ) for a digital road mapping system consisting of a set of segments and nodes each having their importance index, said nodes and segments being put together so as to represent a road network formed of a plurality of meshes of different importance indices, each of the meshes being defined by a set of nodes of identical or greater value than a given value, defining an area, said method comprising the following steps;
a) via the segments, the nodes surrounding a departure node are scanned so as to determine the cost of each of these nodes; b) said scanning is continued until the point of arrival of the route is reached; c) during said scanning, the nodes are scanned so as to identify the nodes that can be used to form a mesh with a given starting index Id; d) when a mesh with an index Id is identified, the segments whose index is less than this index Id are eliminated; e) scanning the nodes continues so as to identify the nodes that can be used to form a new mesh, whose index Is is greater than that of the preceding mesh; f) segments whose index is less than this new index Is are eliminated; g) steps e and f are repeated until; either the scanning enables the point of arrival of the route to be reached; or a maximum index Im of elimination is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- ) for a digital road mapping system consisting of a set of segments and nodes each having their importance index, said nodes and segments being put together so as to represent a road network formed of a plurality of meshes of different importance indices, each of the meshes being defined by a set of nodes of identical or greater value than a given value, defining an area, said method comprising the following steps;
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11. A route calculation device, comprising:
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a data input unit, for receiving the data associated with a point of departure and those associated with a point of arrival; access to a storage unit comprising a set of road network modeling elements; a calculation unit designed for identifying a plurality of routes enabling each to connect the points of departure and arrival; means of elimination, first for identifying at least one elimination level or threshold and secondly for eliminating at least one portion of the basic set of data whose index is below said elimination level or threshold. - View Dependent Claims (12, 13)
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Specification