METHOD FOR DETECTING GRADE SEPARATED CROSSINGS AND UNDERPASSES
First Claim
1. A method for detecting a grade separated crossing in a digital map using probe data, said method comprising the steps of:
- providing a digital map having at least two road segments crossing one another;
obtaining data from a plurality of probe traces traveling along the at least two road segments at least over a crossing portion of the road segments, said data comprising dilution of precision (DOP) values for a plurality of locations along the at least two road segments;
comparing the DOP values for the at least two road segments; and
determining the presence or absence of a grade separated crossing between the at least two road segments based on said comparison.
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Accused Products
Abstract
A method for determining the existence of an underpass (21) in a digital map by observing probe data is provided. The method includes providing a digital map having at least two road segments (18, 20) and reporting data from a plurality of probe traces traveling along the at least two roads segment (18, 20). Further, analyzing the reported data for dilution of precision (DOP) values. Then, inferring the existence of an underpass (21) along one (18) of the at least two road segments (18, 20) if the DOP values suddenly decrease from a substantially constant value to a decreased value and then suddenly return to the substantially constant value.
8 Citations
13 Claims
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1. A method for detecting a grade separated crossing in a digital map using probe data, said method comprising the steps of:
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providing a digital map having at least two road segments crossing one another; obtaining data from a plurality of probe traces traveling along the at least two road segments at least over a crossing portion of the road segments, said data comprising dilution of precision (DOP) values for a plurality of locations along the at least two road segments; comparing the DOP values for the at least two road segments; and determining the presence or absence of a grade separated crossing between the at least two road segments based on said comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification