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Method of obtaining a three-dimensional map representation and navigation system

  • US 7,002,578 B1
  • Filed: 05/05/2000
  • Issued: 02/21/2006
  • Est. Priority Date: 05/05/1999
  • Status: Expired due to Fees
First Claim
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1. A method for obtaining a three-dimensional map representation for a navigation system from two-dimensional road map data having a network of road segments, comprising:

  • obtaining a field of view from the two-dimensional road map data, wherein the field of view is determined by a plane in a form of a sector of a circle around a virtual viewpoint, and a radius of the circle corresponds to a predetermined visual range; and

    transforming the plane into a third dimension using a polynomial function such that the plane is concave in shape the polynomial function being
    z=Σ

    iai*ri;

    r
    =[(x−

    x
    p)+(y−

    y
    p)2]1/2.

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