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Bearing data for route guidance

  • US 6,704,648 B1
  • Filed: 05/29/2002
  • Issued: 03/09/2004
  • Est. Priority Date: 05/29/2002
  • Status: Expired due to Term
First Claim
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1. A method of forming a geographic database containing data that represents road segments in a geographic area, the method comprising:

  • for at least some of the road segments, determining a view distance from one end point of the road segment;

    selecting a secondary bearing reference point within the view distance;

    determining a secondary bearing from the secondary bearing reference point to a second point along the road segment beyond the secondary bearing reference point in a direction away from the end point; and

    storing data that indicates the secondary bearing in the geographic database.

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