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Navigation system using corridor maps

  • US 6,898,516 B2
  • Filed: 04/30/2003
  • Issued: 05/24/2005
  • Est. Priority Date: 04/30/2002
  • Status: Active Grant
First Claim
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1. A method for displaying a map on a mobile client device, the method comprising:

  • storing map data on a server, the map data defining objects appearing in the map and comprising vector coordinates of the objects in a predetermined frame of reference;

    receiving at the server a request from the client device to provide a map of an area along a route on which a user of the client device is to travel;

    determining a heading of travel of the user on the route;

    transforming the vector coordinates on the server into a rotated frame of reference, which is approximately aligned with the heading of the user;

    downloading to the client device from the server a portion of the map data corresponding to the area along the route and comprising the transformed vector coordinates; and

    rendering on the client device, based on the downloaded map data, an image of the area of the map in the rotated frame of reference.

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