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Multi-scale view navigation system, method and medium embodying the same

  • US 6,907,345 B2
  • Filed: 03/22/2002
  • Issued: 06/14/2005
  • Est. Priority Date: 03/22/2002
  • Status: Expired due to Fees
First Claim
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1. A method for providing navigational information, the method comprising:

  • reading images of source chart data pixels corresponding to a source chart database;

    determining a location of an area of interest in relation to the source chart database information;

    reading cache images of less resolution (scale) than those corresponding to the source chart data pixels;

    using a projection function that loops through source chart data pixels computing their locations and the locations of the corresponding cache images; and

    displaying the source chart data pixels in a close proximity to the area of interest and displaying the cache images in the more distant areas.

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